Gently heat ... U5L14 Formula of a Hydrate Answer Recording Sheet (2).docx. 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. An empirical formula of a chemical compound is the ratio of atoms in simplest whole-number terms of each present element in the compound. Lab – Formula of a Hydrate - Help with calculations Magnesium sulfate ( MgSO 4) is a molecule that loves to hold on to water (hydrophilic). 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. Experimental Question: How can we experimentally determine the formula of an unknown hydrate, A? Record this result in Data Table entry #5. Texas A&M University, Texarkana. On a macroscopic, practical level, the parts will be moles. In this experiment, you will be given a sample of hydrate. The resulting anhydrous compound weighs 3.120 grams. Purpose. Hydrate Lab. 9. Kimberly Graziano & Hyunjae Kim. Complete the folowing and submit your answers as a word document in Canvas. 2. Drawing conclusions Using your answers from items 3 and 4, determine the empirical formula for the copper sulfate hydrate. 0.391 g Li 2SiF 6, 0.0903 g H 2O ? 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: 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. 6. Problem #2: A hydrate of Na2CO3 has a mass of 4.31 g before heating. If the mass of the hydrate was 8.881 g, what are the formula and name of the hydrated compound? What is the formula of the hydrate? 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. CHEM 1311. 8. O. Testable Prediction: Our unknown hydrate may be a hydrate of copper(II) sulfate, magnesium sulfate, iron(III) chloride, or iron(III) nitrate. Practice questions will ask you about hydrates vs. anyhdrates, how to solve for hydrate formulas, and the meaning of n in a hydrate formula. A sample of blue vitriol (cupric sulfate hydrate) is heated. Analyzing results Calculate the percent water in your sample. What is the formula of this hydrate? Virtual Lab Hydrate.docx. The formal name of this hydrate is “magnesium sulfate heptahydrate”. Answers 1) a) 40.51% H 2 O b) 43.83% H 2 O c) 28.9% H 2 O 7. Applying conclusions Calculate the percent water in a mole of copper(II)sulfate pentahydrate using the formula. A residue of 3.60 g of remains from the heating of a 4.76 gram sample of a hydrated calcium chloride. 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. The residue masses 2.48 g. PURPOSE: To determine the percentage of water in a hydrate. formula units and molecules. Determine the mass of the hydrate by subtracting entry #4 from entry #3 in the Data Table. You will determine the mass of the water driven off by heating, as well … 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? Observing our nitrate, it has a white crystalline structure, representing that similar to table salt. 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. Determine the formula for the hydrate from the given information: a. A hydrate is a compound that is … 5. 8. For example, Glucose is C 6 H 12 O 6; it’s empirical formula is CH 2 O. What are the name and the formula of the hydrate? 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