Composition of Hydrates

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Composition of Hydrates

Purpose:

The purpose of this lab was to determine the percentage of water in a hydrate and to calculate the coefficient of the water of hydration of a hydrate.

Data Table:

Analysis:

Hydrate Mass (Before Heating): 24.45-22.03 = 2.42 g

Anhydrous Salt Left (After Heating): 23.71-22.03 = 1.68 g

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Water Lost: 24.45-23.71 = .74 g

Molar Mass of Hydrate used: CuSO4●5H20 = 63.55+32.07+64+10.10+80 = 249.72 g/mole

Molar Mass of Anhydrous Salt: CuSO4 = 63.55+32.07+64 = 159.62 g/mole

Molar Mass of all the Waters in Compound: 5H2O = 80+10.10 = 90.10 g/mole

Theoretical Percentage of Water in Hydrate: 90.10 * 100 = 36.98%

249.72

Experimental Percentage of Water in Hydrate: .74  * 100 = 30.58%

 2.42

Percent Error in the Lab: 36.08 - 30.58 = 15.24%

   36.08

Questions:

1) Regardless of the mass of hydrate, the percentage of water lost stays the same. But, the value is not always the theoretical value, often close; it may vary, ...

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