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Blue copper sulphate becomes white on heating and blue again on adding water. What does this prove?

Answer and explanation

Correct answer: It contained water of crystallisation

Hydrated copper sulphate, CuSO₄·5H₂O, is blue because water molecules are present in its crystal structure. Heating removes this water and produces white anhydrous CuSO₄. Adding water restores the hydrated compound and its blue colour. This reversible colour change is evidence of water of crystallisation, so option A is correct. The other choices do not explain both observations.

Related tags

Copper SulphateHydrated SaltWater Of CrystallisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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