A sample of blue vitriol (cupric sulfate hydrate) is heated. Kimberly Graziano & Hyunjae Kim. Analyzing results Calculate the percent water in your sample. Determine the mass of the hydrate by subtracting entry #4 from entry #3 in the Data Table. The residue masses 2.48 g. Lab – Formula of a Hydrate - Help with calculations Magnesium sulfate ( MgSO 4) is a molecule that loves to hold on to water (hydrophilic). Virtual Lab Hydrate.docx. You will determine the mass of the water driven off by heating, as well … What is the formula of the hydrate? formula units and molecules. 8. Determine the formula for the hydrate from the given information: a. A 4.175 gram sample of a certain hydrate of copper (II) sulfate, CuSO 4 •xH 2 O, is heated until all the water is driven off. Applying conclusions Calculate the percent water in a mole of copper(II)sulfate pentahydrate using the formula. 7. What is the formula of this hydrate? Solution: 1) Determine mass of water driven off: 4.31 minus 3.22 = 1.09 g of water 2) Determine moles of Na2CO3 and water: 6. Testable Prediction: Our unknown hydrate may be a hydrate of copper(II) sulfate, magnesium sulfate, iron(III) chloride, or iron(III) nitrate. CH 2Cl 12.0 g + 2(1.0 g) + 35.5 g = 49.5 g 247.5 / 49.5 = 5 CH 2Cl x 5 = C 5H 10Cl 5 3. What is the molecular formula of the molecule that has an empirical formula of CH 2Cl and a molar mass of 247.5 g/mol? If the mass of the hydrate was 8.881 g, what are the formula and name of the hydrated compound? What are the name and the formula of the hydrate? A hydrate is a compound that is … 9. 2. The formula of the hydrate shows the ratio of the moles of anhydrous salt to the moles of water; in the above case, that ratio is 1:5. 8. O. Record this result in Data Table entry #5. 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. Complete the folowing and submit your answers as a word document in Canvas. Gently heat ... U5L14 Formula of a Hydrate Answer Recording Sheet (2).docx. The formal name of this hydrate is “magnesium sulfate heptahydrate”. Texas A&M University, Texarkana. PURPOSE: To determine the percentage of water in a hydrate. Experimental Question: How can we experimentally determine the formula of an unknown hydrate, A? Drawing conclusions Using your answers from items 3 and 4, determine the empirical formula for the copper sulfate hydrate. On a macroscopic, practical level, the parts will be moles. Water of hydration MgSO 4 • 7H 2 O. Hydrated salt It is not difficult to determine the amount of water of hydration in a hydrate if you do not know its exact formula. Purpose. An empirical formula of a chemical compound is the ratio of atoms in simplest whole-number terms of each present element in the compound. 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. 5. A residue of 3.60 g of remains from the heating of a 4.76 gram sample of a hydrated calcium chloride. For example, Glucose is C 6 H 12 O 6; it’s empirical formula is CH 2 O. Problem #2: A hydrate of Na2CO3 has a mass of 4.31 g before heating. CHEM 1311. In this experiment, you will be given a sample of hydrate. Practice questions will ask you about hydrates vs. anyhdrates, how to solve for hydrate formulas, and the meaning of n in a hydrate formula. Hydrate Lab. The resulting anhydrous compound weighs 3.120 grams. Observing our nitrate, it has a white crystalline structure, representing that similar to table salt. Answers 1) a) 40.51% H 2 O b) 43.83% H 2 O c) 28.9% H 2 O 0.391 g Li 2SiF 6, 0.0903 g H 2O ? Blue vitriol ( cupric sulfate hydrate ) is heated of Na2CO3 has a mass of the hydrate subtracting! 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