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Question
How would you show that blue copper sulphate crystals contain water of crystallisation?
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Solution
Copper sulphate crystals (CuSO4.5H2O) are blue in colour. When copper sulphate crystals are heated strongly, they lose all the water of crystallisation and form anhydrous copper sulphate (which is white).
\[\ce{\underset{(Blue)}{\underset{Hydrated copper sulphate}{CuSO4*5H2O}} ->[Heat] \underset{(White)}{\underset{ Anhydrous copper sulphate}{CuSO4}} + \underset{(Goes away)}{\underset{Water}{5H2O}}}\]
Thus, on strong heating, blue copper sulphate crystals turn white (due to the loss of water of crystallisation).
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