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Question
What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.
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Solution
The dehydration of copper sulphate crystals is a reversible process. So, when water is added to anhydrous copper sulphate, it becomes hydrated and turns blue due to the formation of copper sulphate hydrate.
\[\ce{\underset{(White)}{\underset{Anhydrous copper sulphate}{CuSO4}} + \underset{Water}{5H2O} -> \underset{(Blue)}{\underset{Hydrated copper sulphate}{CuSO4*5H2O}}}\]
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