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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

White anhydrous copper sulphate is CuSO4 and lacks water of crystallisation. When water is added, it becomes hydrated copper sulphate, commonly represented as CuSO4·5H2O, whose crystals are blue. The governing concept is hydration and restoration of the crystal structure. Hence option A is correct. Copper does not burn, sulphur gas is not produced, and the salt does not become an acid.

Related tags

Anhydrous Copper SulphateHydrationWater DetectionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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