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Question
Write down the changes that will be seen in each instance and explain the reason behind them.
Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.
Solution
When pieces of blue vitriol are heated in a test tube, then the crystal structure of blue vitriol breaks down to form a colourless powder and water comes out. This water is called water of crystallization. when water is added to the same test tube, the white powder turns into a blue colour again. This is due to reversible reactions taking place from anhydrous salt to hydrous salt and vice-versa.
CUSO4 . 5H2O ↔ CUSO4 + 5H2O
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