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Why does the blue colour of copper sulphate disappear on heating?

Answer and explanation

Correct answer: Water of crystallisation is removed

Blue copper sulphate crystals contain water of crystallisation and can be represented as CuSO₄·5H₂O. On strong heating, this water is driven out of the crystal structure. The hydrated salt therefore changes to anhydrous copper sulphate, which is white. Reheating is not an addition of sodium, formation of chlorine, or production of sugar, so option A is correct.

Related tags

Copper SulphateHeatingWater Of CrystallisationAnhydrous SaltAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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