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Determination of a Chemical Formula

Determination of a Chemical Formula. Gravimetric Analysis and Percentage Composition. D. 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. For example….

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Determination of a Chemical Formula

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  1. Determination of a Chemical Formula Gravimetric Analysis and Percentage Composition

  2. D The Big Picture Hydrates are compounds that have water molecules as part of the crystal structure. CuSO4. 5 H2O Copper(II) sulfate pentahydrate For example… Often, it is easy to remove the bound water molecules by simply heating. CuSO4. 5 H2O Copper(II) sulfate pentahydrate CuSO4 + 5 H2O Copper(II) sulfate (anhydrous)

  3. Overview Gravimetric Analysis = Analysis by Mass Part 2 Substance under study is a mixture of NaCl and MgSO4 . xH2O Now you know x Your assignment: Determine percentage MgSO4 . xH2O NaCl unaffected by heat Part 1 Compound under study is MgSO4 . xH2O (a hydrate) Your assignment: Determine x Indirect determination

  4. List of Materials • Include Unknown Mixture ID • READ pages 21-22 • 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. Author Assignments 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

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