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Why does white anhydrous copper sulphate turn blue again when water is added?

Answer and explanation

Correct answer: Water of crystallisation is restored

Heating blue CuSO4·5H2O removes its water of crystallisation and produces white anhydrous CuSO4. When water is added again, the copper sulfate hydrates and water molecules become associated with its crystal structure, restoring the blue hydrated form. Thus option A is correct. Copper does not become a gas, sulphate is not destroyed, and no salt-to-sugar conversion occurs.

Related tags

Anhydrous Copper SulphateHydrationColour ChangeWater TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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