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Blue copper sulphate becomes white on heating. What causes this change?

Answer and explanation

Correct answer: Water of crystallisation is removed

The governing concept is dehydration of a hydrated salt. Blue copper sulphate is CuSO₄·5H₂O, whose blue colour is associated with its water of crystallisation. On heating, this water is removed and anhydrous CuSO₄ forms, which is white: CuSO₄·5H₂O → CuSO₄ + 5H₂O. Hence option A is correct; copper does not become gold and sulphate does not turn into oxygen.

Related tags

Copper SulphateWater Of CrystallisationHeatingHydrated SaltAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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