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Why do blue copper sulphate crystals turn white on heating?

Answer and explanation

Correct answer: Because water of crystallisation is lost

Hydrated copper sulphate crystals, CuSO₄·5H₂O, are blue because of their water of crystallisation. On heating, this water is removed and anhydrous copper sulphate, CuSO₄, is formed, which is white. The change is therefore due to loss of bound water, not addition of oxygen or conversion into common salt or an acid. Adding water can restore the blue hydrated form, so option B is correct.

Related tags

Copper-SulphateWater-Of-CrystallisationHydrationHeatingAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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