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Question

A student heated some crystals of hydrated copper sulphate solution. He observed that the blue colour of copper sulphate crystals disappears on heating. What could be the reason behind this? How can he obtain back the blue colour of the copper sulphate crystals? [2 marks]

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Solution

When blue-coloured hydrated copper sulphate crystals are heated, they lose their water of crystallisation and convert into greyish-white-coloured anhydrous copper sulphate crystals. [1 mark]

The blue colour of the copper sulphate crystals can be obtain by adding a few drops of water to anhydrous copper sulphate crystals. [1 mark]

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