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What colour does white copper sulphate become when water is added?

Answer and explanation

Correct answer: Blue

White copper sulphate is anhydrous CuSO₄, formed after hydrated copper sulphate loses its water of crystallisation on heating. When water is added, CuSO₄ combines with five water molecules to form hydrated copper sulphate, CuSO₄·5H₂O, which is blue. The colour change is therefore evidence of hydration, not a change to red, green, or black. Hence option A is correct.

Related tags

Copper SulphateHydrationColour ChangeAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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