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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 are CuSO₄·5H₂O, which contain water of crystallisation. Heating drives this water out of the crystal lattice, producing anhydrous copper sulphate, CuSO₄, which is white or pale grey. Consequently the blue colour disappears, so option A is correct. No sodium is added, and chlorine or sugar is not formed in this dehydration change.

Related tags

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

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