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A blue - coloured salt becomes white on ...

A blue - coloured salt becomes white on heating. Give reason for the above observation. What happens when we add water to the salt obtained after heating ? Also write its formula.

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The blue salt is hydrated copper sulphate `(CuSO_(4).5H_(2)O)`, which loses its water of crystallization and becomes white anhydrous copper sulphate `(CuSO_(4))` upon heating it. On adding water, the anhydrous form again becomes hydrated and the blue colour is regained.
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