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Question

When we put Cuso4 in water after some time we find the solution turns blue . why? Also on heating it what change will occur?

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Solution

Copper sulphate is a hydrated salt which contains 5 molecules of water of crytsallisation, and so is denoted by the chemical formula CuSO4.5H2O. These 5 molecules of water of crytsallisation are responsible for the blue colour of the salt.

However, when copper sulphate is heated for some time, the blue colour disappears and it becomes white-gray in colour. This is because the water molecules are lost on heating and copper sulphate pentahydrate is converted to anhydrous copper sulphate.



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