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Determination of a Chemical Formula Gravimetric Analysis and Percentage Composition.

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1 Determination of a Chemical Formula Gravimetric Analysis and Percentage Composition

2 The Big Picture Hydrates are compounds that have water molecules as part of the crystal structure. CuSO 4. 5 H 2 O Copper(II) sulfate pentahydrate CuSO 4. 5 H 2 O Copper(II) sulfate pentahydrate CuSO H 2 O Copper(II) sulfate (anhydrous)  Often, it is easy to remove the bound water molecules by simply heating. For example…

3 Part 2 Substance under study is a mixture of NaCl and MgSO 4. xH 2 O Now you know x Your assignment: Determine percentage MgSO 4. xH 2 O NaCl unaffected by heat Part 1 Compound under study is MgSO 4. xH 2 O (a hydrate) Your assignment: Determine x Indirect determination Gravimetric Analysis = Analysis by Mass Overview

4 List of Materials Include Unknown Mixture ID READ pages If you heat something, it gets hot!! Do not place hot crucibles on notebooks or bench top Please, reread the previous sentence Calculations You must show in detail how you will treat your data for formula determination and unknown mixture— suggest selecting sample data and working through a calculation Never ever weigh a hot crucible! Each group member must sign and print name

5 This investigation, Author 2: Introduction and Conclusion 3: Discussion 1: Data/Results and Experimental This investigation, Author A: Introduction, Conclusion, Data/Results B: Discussion and Experimental Author Assignments

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