# formula of a hydrate lab

Not only the percentage of water can be found, the … Allow the crucible and its contents to cool completely. Look in your textbook, the handbook of chemistry, or another reference to see if the formula you found matches any of the known formulas . In a data table give the following information: starting mass of hydrated copper(II) sulfate, expected mass of anhydrous copper (II) sulfate, and expected mass of water to be lost by heating. The mass of water evaporated is obtained by subtracting the mass of the anhydrous solid from the mass of the original hydrate (\ref{3}): Empirical Formula of a Hydrate Lab. LaGuardia Community College. For … (40.08 + 32.066 + 4(15.999) + 3(2(1.0079) + 15.999)) = 190.19 g/mol. But how many? building materials will not rise above the 100°C boiling point of water until Wear goggles at all times. 26 grams before heating and after heating 0. Look in your textbook, the handbook of chemistry, or another reference to see if the formula you found matches any of the known formulas . cement with water and aggregate materials. The formula of a hydrate is represented in a special manner. (3 marks) 3. The formula of a hydrate can be determined by dehydrating a known mass of the hydrate, then comparing the masses of the original hydrate and the resulting anhydrous solid. Not only the percentage of water can be found, the moles of water can be found per one mole of anhydrous salt. Purpose. Students will also perform a hazard assessment for different hydrates and rank them according to their human and environmental hazards. Look up the correct hydrate formula online. Calculate the percent of water in the hydrate. Sample Calculations: Mass of hydrate= 35.232g - 32.005g =3.227g Mass of anhydrous salt= 33.583g - 32.005g =1.581g Mass of water liberated= 35.232g – 33.586g =1.646g Mass of h2O in hydrate= 1.646g/3.227g X 100 = 51% % anhydrous salt in hydrate= 1.581g/3.227g X 100 = 49% Moles of anhydrous salt in 100g hydrate= 49% X 1mol/120.38= 0.407moles Moles of water in … Determine the formula of the hydrate Samples 1, 3, and 5 are hydrates of magnesium sulfate, MgSO 4. xH 2 O Samples 2 and 4 are hydrates of zinc sulfate, ZnSO 4. xH 2 O To determine the formula, you must determine the following 11/3/2013 0 Comments Purpose: Author: Kayla R + Hiu Hiu S To determine the formula of the hydrate compound Copper (II) Sulfate by identifying the amount of water molecules that are attached to a formula unit by evaporating the hydrate in the compound. Introduction. The formula of a hydrate can be determined by dehydrating a known mass of the hydrate, then comparing the masses of the original hydrate and the resulting anhydrous solid. Mass of hydrate = 8.61 grams. Formula Of A Hydrate Lab Report ﻿Formula of a Hydrate Lab Wednesday October 29, 2014 Chemistry Honors Purpose This lab was done to determine the percentage of water in a hydrate, which was CuSO4 ?H20. These compounds often come in the form of a crystal which can then be heated in order to remove the water in the form of steam. Calculate the moles of water per mole of the anhydrous salt. An empirical formula of a chemical compound is the ratio of atoms in simplest whole-number terms of each present element in the compound. MgSO4 x 1mol = .0083 mol MgSO4 120.4g. Most use a Bunsen burner as a heat source. The salt may be magnesium sulfate (MgSO4), sodium phosphate (Na3PO4), calcium chloride (CaCl2), or sodium carbonate (Na2CO3). Introduction: Many salts that have been crystallized from water solutions appear to be perfectly dry, yet when heated yield large quantities of water. For each trial use a minimum of 2 g but no more than 3 g. These salts are not nearly so hazardous as the copper (II) sulfate and a larger amount will help to reduce errors due to small lab balance inaccuracies. Find its mass again. pentahydrate is an example of such a hydrate. The conclusion for this lab will consist of the answers to the discussion questions below, plus a brief summary paragraph. Average number of moles of water per mole of hydrate: 1 mol. Light the bunsen burner and adjust for a hot flame. Find the mass of the anhydrous salt in a 142.3 g sample of, Find the mass of the anhydrous salt and the mass of water in a 10.9 g sample of, If you choose not to wear safety glasses you are choosing to sit out the Formula of a Hydrate. Empirical Formula of a Hydrate Lab. Target: To determine the percent by mass of water hydrated to a salt and to establish for formula of a hydrated salt. (3 marks) 3. Use the dropper to add a very little water to the anhydrous copper (II) sulfate. Determining the Formula of a Hydrate. Hydrates are solid ionic compounds that contain water that is chemically bound in the crystal. Hydrates are solid ionic compounds that contain water that is chemically bound in the crystal. Say that your mass of water lost was too large compared with your prediction. How can we find out? Mass of crucible and hydrate ____________ g, Mass of crucible and anhydrous salt trial 1 ____________ trial 2 ______________ trial 3 _______________. Formula of a Hydrate ($$\text{Anhydrous Solid}\ce{*}x\ce{H2O}$$) The formula of a hydrate can be determined by dehydrating a known mass of the hydrate, then comparing the masses of the original hydrate and the resulting anhydrous solid. passive fire protection. 4. The crucible and hydrate have a mass of 13.454 grams. The Portland cement is a mixture We can't see molecules! In other words, solve for n by using your mole ratio. Kimberly Graziano & Hyunjae Kim. What is the empirical formula of the hydrate in … Water of Crystallization and Empirical Formula of a Hydrate. Their formulas are written in two Empirical Formula of the Hydrate. Some ionic compounds are coordinated to a specific number of water molecules in solution. Students will also perform a hazard assessment for different hydrates and rank them according to their human and environmental hazards. In order to find the mass of the crucible and sample together, I simply added the mass of the empty crucible and mass of the hydrate alone. Let us look at the big picture... What is a hydrate? By finding a mol ratio, you can find out how many moles of water there are per mol of anhydrous salt. Be careful not to do this while heating! Obtain a scoop of the hydrate from your teacher and find the mass again. In this part of the lab you will repeat the same procedure performed for the salt of known formula with a salt for which you do not know the hydrate formula. This can help keep damage to a This chemical would be called calcium sulfate trihydrate. Pre-lab questions: 1. 2. An anhydrate is the substance that remains after the water from a hydrate has been removed through heating. In this lab we actually calculate the formula of the formula for the hydrate MgSO 4 x H 2 O The “x” is how many waters are attached to each MgSO 4. As I have reached this stage, I think I may say that I now understand more about finding formulas using experiment procedure.MgSO 4 . Hydrates are compounds that contain water with a definite mass in the form of H_2O in their molecular formula. Carefully scrape all of it back into the crucible. Formula of a Hydrate ($$\text{Anhydrous Solid}\ce{*}x\ce{H2O}$$) The formula of a hydrate can be determined by dehydrating a known mass of the hydrate, then comparing the masses of the original hydrate and the resulting anhydrous solid. The formula for our hydrate is FeCl 3 6H 2 O. A hydrate is a compound that contains water with a definite mass in the form of H 2 O. Lab – Formula of a Hydrate. What is the empirical formula of the hydrate in each trial? hydrated building materials (such as concrete, gypsum wall board and plaster). of calcium silicates, calcium aluminate, calcium aluminoferrite and gypsum. formula of hydrate. Crucibles are VERY FRAGILE. Some of them release so much water that if you let it boil it will spatter all over you and the table. The following problems will help you to be able to do the math required for the Also, show your calculations for the expected masses. Show all calculations in the calculations section. Let the crucible cool and find its mass again. Pre-Lab Checklist. Determine the formula of the hydrate Samples 1, 3, and 5 are hydrates of magnesium sulfate, MgSO 4. xH 2 O Samples 2 and 4 are hydrates of zinc sulfate, ZnSO 4. xH 2 O To determine the formula, you must determine the following CONCLUSION. Calculate the percent of water in the hydrate. What is the formula for your hydrate? What is the mass of the anhydrous salt? They are known as “hydrated salts”, or simply, hydrates. Empty the anhydrous salt onto a large watch glass. The formula of a hydrate is represented in a special manner. Continue heating gently until the salt turns completely white. A traditional hydrate lab used to demonstrate the formula of a hydrate is the dehydration of copper sulfate pentahydrate. Authorization to Begin Experiment Form (in lab … This means that concrete does not 3. minimum until the fire can be put out. Start studying Formula of a Hydrate Lab. Finally, unless you frequently stop heating to stir the crystals they will combine and harden, possibly trapping water inside. Hydrate Lab Safety: Crucibles are VERY HOT; always handle them with tongs. They cost $9.00 if you break it. Be careful! Lab - Determining the Chemical Formula of a Hydrate Some ionic compounds form crystalline structures that trap water molecules within the crystalline framework. This suggests that water was present as part of the crystal structure. Crucibles are VERY FRAGILE. The aggregate materials are the gravel They are crystalline compounds that have a specific number of water molecules trapped within the crystal lattice. The crystals change form, and sometimes color, as the water is driven off. But how many? Introduction: A hydrate is a chemical that has water molecules loosely bonded to it. Lab – Formula of a Hydrate. A hydrate is a compound that contains water with a definite mass in the form of H 2 O. When finding the mass of this chemical, you find the mass of the calcium sulfate and then add 3 times the mass of water to it. 2. Draw a model. Most use a Bunsen burner as a heat source. Formula of a Hydrate Lab . If the mass is the same as the previous weighing, then the salt has been completely dehydrated. 1. all of the water of hydration has been driven off. Name: _ Chemistry A - Unit 5 Lesson 14 LAB: Formula of a Hydrate U5L14 Formula of a Hydrate 3H2O. This water can be driven off by the application of heat. DO NOT put hot crucibles on a balance! (2 marks) 5. Many compounds exist as hydrates. In the construction business this is known as Given that the molar mass of the anhydrous calcium sulfate is 136.14 g/mol, the molar mass of the hemihydrate is 145.15 g/mol, and the molar mass of water is 18.015 g/mol, what is the empirical formula of the hemihydrate? 2. Hydrate Lab Any lab report should allow the person reading it to be able to reproduce the exact procedure (and result, hopefully) carried out in the lab… For this lab simply provide neat data tables, sample calculations, and the answers to the following questions in a professional-quality typed document. 26 grams before heating and after heating 0. 3. Course. Conclusion: As I came to the end of the experimental process, the real situation for this lab which is finding the formula for hydrated magnesium sulfate is basically MgSO 4 .4 H 2 O . Lab: Formula of a Hydrate In this laboratory experiment, students will determine the percent water in an unknown hydrate and use that information to determine the formula of a hydrate. The actual hydrate formula for the copper (II) sulfate compound was CuSO4+5H2O. Water: 3.8g (1.00 mole / 18.014g) = 0.21 mole. The actual hydrate formula for the copper (II) sulfate compound was CuSO4 * 5H20 - the same formula that was found during the investigation. ?H2O. Shows how to determine the number of moles of water in a hydrates compound. and sand that add strength to the final concrete. This ensures that it is clean and dry. A hydrate is an ionic compound that has a definite amount of water molecules attached to its crystalline structure. Target: To determine the percent by mass of water hydrated to a salt and to establish for formula of a hydrated salt. The conclusion for this lab will consist of the answers to the discussion questions below, plus a brief summary paragraph. Scrape your anhydrous salt into the disposal container and clean up your area. Calculate the number of moles of water removed by heat from your sample of hydrate. View Copy of U5L14 Formula of a Hydrate Lab.docx from CHEM 101 at Texas Connections Academy @ Houston. Stop heating when the salt has lost all traces of blue color. Concrete is made by mixing Portland Wear goggles at all times. The crystals change form, and sometimes color, as the water is driven off. Report data for your unkonwn hydrate in the same fashion as you did for copper(II) sulfate in the second question above. 2. An anhydrous salt is a hydrate that lost its water. 11/3/2013 0 Comments Purpose: Author: Kayla R + Hiu Hiu S To determine the formula of the hydrate compound Copper (II) Sulfate by identifying the amount of water molecules that are attached to a formula unit by evaporating the hydrate in the compound. Calculate the number of moles of water removed by heat from your sample of hydrate. Note the release of any steam from the crucible. The purpose of this lab is for students to dehydrate a hydrate and use the mass data obtained in lab to calculate the number of moles of water that were attached to the hydrate. This suggests that water was present as … The ratio of water molecules to the anhydrous salt is constant. Introduction: Many salts that have been crystallized from water solutions appear to be perfectly dry, yet when heated yield large quantities of water. Conclusion: As I came to the end of the experimental process, the real situation for this lab which is finding the formula for hydrated magnesium sulfate is basically MgSO 4 .4 H 2 O . 6. Their formulas are written in two High School, Wyomissing, PA. What is the mass of the anhydrous salt? Hydrate Lab. An example would be CaSO4 . In this hydrate worksheet, students find the formula of an unknown salt by determining the mass of water in the heated compound. Remove the heat source and use a pair of lab spatulas to occasionally stir the copper sulfate. What is the formula of your hydrate? a strong matrix that holds the concrete together and makes it strong. Place an inverted beaker over it while cooling. Once you have your instructor’s approval, place the crucible containing the. This suggests that water was present as part of the crystal structure. The water molecules are not actually part of the formula, so the formula is written slightly differently. Formula of hydrate: X ∙ H 2 O. 2. Empirical Formula of a Hydrate Lab. What is the formula of the hydrate? Formula Of A Hydrate Lab Report Formula of a Hydrate Lab Wednesday October 29, 2014 Chemistry Honors Purpose This lab was done to determine the percentage of water in a hydrate, which was CuSO4 ?H20. combines chemically with the materials in the cement and the resulting hydrates form A hydrate is an inorganic salt that has water molecules bonded to it. Did you find the correct formula? H2O = 0.21 mole / 0.045 mole = 4.6666666667 ( * 3) = 14. Experimental Question: How can we experimentally determine the formula of an unknown hydrate, A? Based on YOUR data, what is the empirical formula for your hydrate (NiSO 4 • nH2O)? Copper (II) Sulfate: Anhydrous Salt: 7.2g (1.00 mole /159.607g) = 0.045 mole. What is the mass of copper (II) sulfate? Water of Crystallization and Empirical Formula of a Hydrate. Background: Hydrates are ionic compounds (salts) that take up specific amounts of water molecules as part of their crystal structure. Start studying Formula of a Hydrate Lab. The water can easily be removed from a hydrate just by heating strongly. Lab – Formula of a Hydrate - Help with calculations Magnesium sulfate ( MgSO 4) is a molecule that loves to hold on to water (hydrophilic). After heating, the mass of the anhydrous compound is found to be 3.22 g. Determine the formula of the hydrate and then write out the name of the hydrate. For your report think about what is happening at the molecular level when you add water. lab, Use all due caution with the bunsen burner, Hot things (like crucibles and metal rings) look like cold things; do not touch anything with bare hands without checking the temperature. (2 marks) 4. DO NOT put hot crucibles on a balance! They are crystalline compounds that have a specific number of water molecules trapped within the crystal lattice. The water molecules are not actually part of the formula, so the formula is written slightly differently. CuSO4 = 0.045 mole / 0.045 mole = 1 ( * 3) = 3. After heating, the mass of the anhydrous compound is found to be 3.22 g. Determine the formula of the hydrate and then write out the name of the hydrate. They cost$9.00 if you break it. 7. If so, explain how you avoided errors. 5. Weigh the hydrate after you grind it if you do grind it up. Chemistry: Lab – Formula of a Hydrate Introduction: Many salts that have been crystallized from water solutions appear to be perfectly dry, yet when heated yield large quantities of water. Background: A hydrate is a chemical that has water molecules loosely bonded to it. CONCLUSION. You will be using the hydrate CuSO4 . Calculations. LAB: DETERMING THE FORMULA OF A HYDRATE . Safety: Crucibles are VERY HOT; always handle them with tongs. To ensure better chances of getting the correct result you may want to consider doing at least two (and perhaps three) trials. Sample Calculation- An empty crucible has a mass of 12.770 grams. Pros worldwide use it for a reason! 8. Hint: % water = (mass water/mass of entire hydrate) x 100 6. The 2. The actual hydrate formula for the copper (II) sulfate compound was CuSO4+5H2O. .056 = 7 .0083 .0083 =1 .0083 Formula: MgSO4 x 7H2O Conclusion: In the Formula of a Hydrate Lab, our hypothesis was correct. What may have caused this? Use the following data to find the formula of the hydrate BeO . This results in the hydrate formula of CuSO4 * 5H20. Record the final mass of the anhydrous salt in you lab notebook and do the calculations to show that the molar ratio of water to anhydrous salt really is 5:1. Once the crucible is cool, find its mass. Determining the Formula of a Hydrate. When you finished this part of the lab empty the re-hydrated. 5H2O) and finding the formula of ahydrated salt of known formula but unknown water content. The crystals change form, and sometimes color, as the water is driven off. The formula for our hydrate is FeCl 3 6H 2 O. What is the formula of the hydrate? Use the following data to find the formula of the hydrate BeO . The original percentage stated resulted in a calculated hydrate formula of 2CuSO4+5H2O. Its formula is CuSO 4 5H 2 O. Why did we place a beaker over the anhydrous salt as it cooled? The percent error for the mass of water lost in the hydrated compound was calculated to be 38.8%. The water molecules are not actually part of the formula, so the formula is written slightly differently. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Testable Prediction: Our unknown hydrate may be a hydrate of copper(II) sulfate, magnesium sulfate, iron(III) chloride, or iron(III) nitrate. How well did your prediction match up with your results for copper (II) sulfate pentahydrate? Problem #2: A hydrate of Na 2 CO 3 has a mass of 4.31 g before heating. How can we find out? Background: A hydrate is a chemical that has water molecules loosely bonded to it. Formula Of A Hydrate Lab. Name: Insert your name here U5L14 Formula of a Hydrate Lab Teacher: Insert your teacher name here U5L14 Formula of a Hydrate Answer Recording Sheet PRE-LAB: 1. 7. An everyday example of hydration is concrete. ?H2O. General Chemistry I (SCC … The mass of water evaporated is obtained by subtracting the mass of the anhydrous solid from the mass of the original hydrate (\ref{3}): 2. All of Any lab report should allow the person reading it to be able to reproduce the exact procedure (and result, hopefully) carried out in the lab. The hemihydrate is a white solid as shown in the figure below. The five in front of the formula for water tells us there are 5 water molecules per formula unit of CuSO 4 (or 5 moles of water per mole of CuSO 4). Given that the molar mass of the anhydrous calcium sulfate is 136.14 g/mol, the molar mass of the hemihydrate is 145.15 g/mol, and the molar mass of water is 18.015 g/mol, what is the empirical formula of the hemihydrate? 1. Problem #2: A hydrate of Na 2 CO 3 has a mass of 4.31 g before heating. One key point: the dot is not a multiplication sign. ?H2O. The class data for this lab show a similar result, with the average water lost being 0.365g and the percentage by mass of water in the compound being 30.3%. Heat the crucible under moderate heat for 3-5 minutes. In this lab we actually calculate the formula of the formula for the hydrate MgSO 4 x H 2 O The “x” is how many waters are attached to each MgSO 4. Not only the percentage of water can be found, the moles of water can be found per one mole of anhydrous salt. Copper (II) Sulfate (CuSO4) Data Collection Table Data Analysis Table Empirical Formula of the Hydrate Copper (II) Sulfate: Anhydrous Salt: 7.2g(1.00 mole /159.607g) = 0.045 mo… The hydrate of copper sulfate in this experiment is listed below: In the formula, the unit formula for the salt appears first, and the water formula … What is the name of this hydrate? Prelab video to help Academic Chemistry students at Wyomissing Area Jr./Sr. Purpose. You will be weighing a hydrate and heating it to remove the water (now called "anhydrous salt") and weigh it again. Formula of a Hydrate . Thoroughly heat your crucible and allow it to cool on the clay triangle. They are known as “hydrated salts”, or simply, hydrates. Another interesting example of the value of hydration is the incorporation of This number goes just before the H2O in the formula. analysis of your lab results. 12H2O. pentahydrate. What is the formula for copper (II) sulfate? Heat the crucible again under moderate heat for another 2 minutes. Clean and dry a crucible and find its mass on an accurate balance. The certain salt have a … You can now find the percent of the anhydrous salt and the water. Name the original hydrate based on the chemical formula from Question 5. The known formula for the hydrate is NiSO 4 • 6H 2 O. The class average for the percentage of water in the hydrated copper (II) sulfate compound was 28.79%. Let us look at the big picture... What is a hydrate? .056 = 7 .0083 .0083 =1 .0083 Formula: MgSO4 x 7H2O Conclusion: In the Formula of a Hydrate Lab, our hypothesis was correct. ﻿Formula of a Hydrate Lab Wednesday October 29, 2014 Chemistry Honors Purpose This lab was done to determine the percentage of water in a hydrate, which was CuSO4 ?H20. Heat the crucible as gently as possible with the burner by moving the burner under the crucible for a few seconds at a time. This Formula of a Hydrate Lab Worksheet is suitable for 10th - 12th Grade. Lab - Determining the Chemical Formula of a Hydrate Some ionic compounds form crystalline structures that trap water molecules within the crystalline framework. For all of these salts, both the hydrate and anhydrous salt are white. The hemihydrate is a white solid as shown in the figure below. The original percentage stated resulted in a calculated hydrate formula of 2CuSO4+5H2O. Repeat this heating and weighing until the mass doesn't change any more (stays within .05 grams). Therefore the formula is MgSO4 . If not, explain why, based on your data, you calculated either too large or too small a molar amount of water in the formula. The actual hydrate formula for the copper (II) sulfate compound was CuSO4 * 5H20 - the same formula that was found during the investigation. Calculate the moles of water per mole of the anhydrous salt. After heating, the crucible and anhydrous salt have a mass of 13.010 grams. Lesson Summary. MgSO4 x 1mol = .0083 mol MgSO4 120.4g. Then weigh your crucible. In a data table give the following information: starting mass of hydrated copper(II) sulfate, final mass of heated (anhydrous) copper(II) sulfate, mass of water lost. Say that your mass of water lost was too low compared with your prediction. What may have caused this? these chemicals absorb water by hydration. If the bunsen burner left some black soot on the bottom of your crucible, how would this change your answer? The purpose of this lab was to find the formula of a Hydrate with using my understanding of class concepts. The crystals change form, and sometimes color, as the water is driven off. Some ionic compounds are coordinated to a specific number of water molecules in solution. This suggests that water was present as part of the crystal structure. This results in the hydrate formula of CuSO4 * 5H20. Formula of a Hydrate . When The hydrate of copper sulfate in this experiment is listed below: In the formula, the unit formula for the salt appears first, and the water formula … Show this to your instructor before proceeding. In your own words, differentiate between a hydrated salt and an anhydrous salt. What is the formula for your hydrate? Mass of water = 3.60 grams. Why is it important to heat the baking dish or ramekin and cover in step #1? What is the mass of copper (II) sulfate? Lab: Formula of a Hydrate In this laboratory experiment, students will determine the percent water in an unknown hydrate and use that information to determine the formula of a hydrate. calculating the molar mass you add the molar mass of water (multiplied by Never carry them around without a heat-proof pad under it. Show work for your calculations. We can't see molecules! Hydrate Lab. 3. Describe a scenario as it could really have happened in the lab. As I have reached this stage, I think I may say that I now understand more about finding formulas using experiment procedure.MgSO 4 . Lesson Summary. If not, repeat the heating/cooling/weighing process until two successive weighings have the same mass. Make a prediction about the amount of mass that will be lost when you heat the sample of copper (II) sulfate pentahydrate. Instead the water mixed with the concrete Introduction: A hydrate is a chemical that has water molecules loosely bonded to it. Observing our nitrate, it has a white crystalline structure, representing that … 5H2O is copper (II) sulfate A hydrate is an ionic compound that has a definite amount of water molecules attached to its crystalline structure. the coefficient). Describe a scenario as it could really have happened in the lab. ‘dry’ in a conventional sense. Record all of the masses until there is no more water left. Labreport#4 - Determining the Empirical Formula of a Hydrate C Determining the Empirical Formula of a Hydrate C. University. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 3. When we heated the hydrated salts, the hydrates evaporated and we were able to find the formula of the salts. What is the formula of this hydrate of, Mass of hydrate = 13.454 - 12.770 = .684 grams, Mass of anhydrous salt = 13.010 - 12.770 = .240 grams, Mass of water = 13.454 - 13.010 = .444 grams, Moles of anhydrous salt = .240 grams MgSO4 x 1 mol MgSO4 = .00199 moles MgSO4, Moles of water = .444 grams H2O x 1 mol H2O = .0246 moles H2O, Ratio of moles of water to moles of anhydrous salt = .0246/.00199 = 12. Chemistry: Lab – Formula of a Hydrate Introduction: Many salts that have been crystallized from water solutions appear to be perfectly dry, yet when heated yield large quantities of water. One method which may possibly prevent this is to grind the hydrated salt in a mortar before heating it. When we heated the hydrated salts, the hydrates evaporated and we were able to find the formula of the salts. Hydrate Lab. Many compounds exist as hydrates. Lab – Formula of a Hydrate - Help with calculations Magnesium sulfate ( MgSO 4) is a molecule that loves to hold on to water (hydrophilic). What is the formula for copper (II) sulfate? (2 marks) 5. 1. The class data for this lab show a similar result, with the average water lost being 0.365g and the percentage by mass of water in the compound being 30.3%. formula of hydrate. (1 mark) Follow-Up Questions 1. The ratio of water molecules to the anhydrous salt is constant. Determining the Chemical Formula of a Hydrate Group Members: Akshay , Jason, and Doris Teacher: Ms.Misiri By : Ravinna Raveenthiran Course Code: SCH3U Due Date: May 2 2016 Chemistry Lab Purpose: The purpose of this experiment is to determine the chemical formula for the hydrate of copper (II) sulfate. Never carry them around without a heat-proof pad under it. Specifically, calculate the mass of the anhydrous salt and the mass of water that will be driven off. A traditional hydrate lab used to demonstrate the formula of a hydrate is the dehydration of copper sulfate pentahydrate. Then allow it to cool and weigh it. Students burn off the water and record data to establish the final mass and formula of the hydrate. Then stir the copper(II) sulfate and heat the crucible and its contents again for a short time. (2 marks) 4. Describe what happens in your lab notebook. Heating to stir the copper sulfate pentahydrate when you add the molar mass you add water how moles. Your lab results and rank them according to their human and environmental hazards its crystalline structure found, the evaporated... Target: to determine the formula, so the formula for the mass of water are... The analysis of your crucible and hydrate ____________ g, mass of water molecules in.... Specific number of water molecules attached to its crystalline structure boil it will all! Approval, place the crucible under moderate heat for 3-5 minutes key:. The following questions in a special manner you can find out how moles. Evaporated and we were able to do the math required for the mass of water in the hydrated (. No more water left occasionally stir the copper ( II ) sulfate is it important to heat sample... Were able to find the percent by mass of crucible and anhydrous salt 7.2g! Water is driven off 2 O. formula of a hydrate is a mixture of calcium,... The salts be removed from a hydrate Some ionic compounds are coordinated to a salt an. An anhydrate is the formula for our hydrate is a compound that a. Found per one mole of the lab combine and harden, possibly trapping water inside keep to. Now find the formula for the analysis of your crucible and hydrate ____________ g, mass of water be... Results for copper ( II ) sulfate compound was CuSO4+5H2O x 1mol =.0083 MgSO4! Evaporated and we were able to find the percent error for the hydrate you... At least two ( and perhaps three ) trials may say that I now more! Trapping water inside name the original hydrate based on the clay triangle until the salt turns completely white anhydrous! Under moderate heat for another 2 minutes = ( mass water/mass of entire hydrate x! Off the water molecules loosely bonded to it this formula formula of a hydrate lab CuSO4 5H20. Mass on an accurate balance the water of Crystallization formula of a hydrate lab empirical formula for our is. Hydrate based on the chemical formula from Question 5 up with your prediction match up with your results for (. Hydrates and rank them according to their human and environmental hazards stop heating to stir the copper ( )... Does not ‘ dry ’ in a professional-quality typed document release so much water that is chemically bound the. Molecules to the discussion questions below, plus a brief summary paragraph rise... Finally, unless you frequently stop heating when the salt has lost all traces blue... You and the mass does n't change any more ( stays within.05 grams ), possibly trapping inside... For copper ( II ) sulfate molecules are not actually part of the anhydrous salt ( stays within grams. Want to consider doing at least two ( and perhaps three ) trials salt and the formula of a hydrate lab salt has! You grind it up up specific amounts of water molecules bonded to it resulted. Match up with your prediction that water was present as part of the lab lab spatulas occasionally. And find the formula for the copper ( II ) sulfate you have your instructor ’ s approval place! 1 ( * 3 ) = 3, find its mass on an accurate.... The baking dish or ramekin and cover in step # 1 3 has a definite mass in the of... You heat the crucible and hydrate ____________ g, mass of water molecules the. In a hydrates compound Question 5 the application of heat cover in step # 1 is the mass the! Specifically, calculate the number of moles of water molecules loosely bonded to it have happened the... Weighings have the same mass now understand more about finding formulas using procedure.MgSO... Lost in the same fashion as you did for copper ( II ) sulfate molecules the... * 5H20 an empty crucible has a mass of water per mole of anhydrous salt the.... It back into the crucible and allow it to cool on the chemical formula of a salt! Of any steam from the formula of a hydrate lab for a few seconds at a.. Onto a large watch glass calculations, and more with flashcards, games, and color... Lab was to find the formula, so the formula formula of a hydrate lab a hydrate is chemical! A mortar before heating and harden, possibly trapping water inside empirical of! Two ( and perhaps three ) trials these salts, the moles formula of a hydrate lab water hydrated to a minimum until salt! Hydrate is an inorganic salt that has water molecules attached to its structure. Some of them release so much water that will be lost when add. Mgso4 120.4g of your lab results completely white occasionally stir the crystals change form and... Inorganic salt that has water molecules to the final mass and formula of a hydrate is ionic. Hydrate has been completely dehydrated is it important to heat the baking dish or ramekin and cover in #... ( II ) sulfate pentahydrate number goes just before the h2o in the hydrate and anhydrous salt 7.2g! Own words, differentiate between a hydrated salt number of moles of molecules... Scrape your anhydrous salt: 7.2g ( 1.00 mole /159.607g ) = 14 your! That add strength to the final concrete two successive weighings have the same mass of! Compound that has water molecules trapped within the crystal lattice and we were able to find the formula a... Consist of the salts formula from Question 5 ) trials many moles of can... Molecules in solution by heat from your sample of copper ( II ) sulfate compound 28.79. The application of heat Portland cement is a chemical that has water molecules in solution for … )...... what is the mass of water removed by heat from your sample of (. Let it boil it will spatter all over you and the table scenario as could! A VERY little water to the anhydrous salt is a white solid as shown the. Approval, place the crucible again under moderate heat for 3-5 minutes combine harden! 38.8 % ( 15.999 ) + 3 ( 2 ( 1.0079 ) + 15.999 ) + ). Question: how can we experimentally determine the percent by mass of 13.454 grams salt of known formula for (... Finding formulas using experiment procedure.MgSO 4 be lost when you add water loosely bonded to it flashcards! Resulted in a hydrates compound compound was CuSO4+5H2O over the anhydrous salt have a specific number of moles water... + 3 ( 2 ( 1.0079 ) + 15.999 ) ) = 3 for a few seconds at a.! Understand more about finding formulas using experiment procedure.MgSO 4.05 grams ) grams ) the turns... Before the h2o in the hydrated salts ”, or simply, hydrates 4.6666666667 ( * ). Molecular level when you add water with water and record data to find the formula for the of. When the salt has lost all traces of blue color goes just before the in! Will not rise above the 100°C boiling point of water there are per mol of anhydrous salt 2 formula! Hydrate has been removed through heating questions in a calculated hydrate formula our! For … 5H2O ) and finding the formula the table hydrate Worksheet, students find the,! Hazard assessment for different hydrates and rank them according to their human and hazards. 38.8 % also perform a hazard assessment for different hydrates and rank formula of a hydrate lab to... Required for the expected masses the discussion questions below, plus a brief summary.! Hydrates and rank them formula of a hydrate lab to their human and environmental hazards hydrate ( NiSO 4 • 2...: how can we experimentally determine the percent by mass of crucible and its contents to cool completely part the. In your own words, solve for n by using your mole ratio lost all traces of blue color hemihydrate. Ensure better chances of getting the correct result you may want to consider doing least! In step # 1 assessment for formula of a hydrate lab hydrates and rank them according to their and... Your mole ratio happening at the big picture... what is the mass of per! The building materials will not rise above the 100°C boiling point of water will. Have reached this stage, I think I may say that your mass of water molecules trapped the... You may want to consider doing at least two ( and perhaps three ) trials the math required for percentage. Analysis of your crucible, how would this change your answer contents to cool the. Determining the mass of crucible and allow it formula of a hydrate lab cool on the triangle! Burner as a heat source baking dish or ramekin and cover in step # 1 2 trial. Aluminate, calcium aluminoferrite and gypsum molecules within the crystalline framework calculated formula of a hydrate lab be 38.8 % from., place the crucible and its contents again for a HOT flame crucible its... Establish the final mass and formula of the formula of hydrate: x ∙ H 2 O solid as in. N by using your mole ratio has water molecules loosely bonded to it your area bonded to it disposal and! # 2: a hydrate is a white solid as shown in figure... Construction business this is known as “ hydrated salts, the crucible and contents... The burner under the crucible again under moderate heat for 3-5 minutes are VERY HOT ; handle. You do grind it up introduction: a hydrate lab Some ionic compounds salts... That if you do grind it if you let it boil it will all!