lab 2 experiment 12

lab 2 experiment 12 - Hydrates Experiment 12 Instructor:...

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Hydrates Experiment 12 Instructor: Mr. Richardson
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27 August 2010 Rena Lu Lab partners: Sam Snider, Sonia Ajmera Lab 1 1st, 2nd pd Purpose Chemical compounds that contain discrete water molecules as part of their crystalline structure are called hydrates. Hydrates occur quite commonly among chemical substances, especially among ionic substances. Such compounds are either prepared in, or recrystallized from, aqueous solutions. Hydrates exist for ionic compounds most commonly but hydrates of polar and nonpolar covalent molecules are also known. Procedure Weigh casserole. Fill with copper (II) sulfate pentahydrate and weigh again to find the mass of CuSO 4 •5H 2 O. Heat substance over Bunsen burner, stirring occasionally until a complete color change is achieved. Let cool on cooling tile, and reweigh when cooled. Add water to rehydrate the compound. For nickel (II) chloride hexahydrate and cobalt (II) chloride hexahydrate, record original color. Heat sample over Bunsen burner until water has evaporated and color has changed. Record color,
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lab 2 experiment 12 - Hydrates Experiment 12 Instructor:...

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