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Blue copper sulphate crystals turn white on heating. This change occurs due to removal of what?

Answer and explanation

Correct answer: Water of crystallisation

Blue copper sulphate crystals are hydrated copper sulphate, CuSO4·5H2O. The attached water molecules are called water of crystallisation and give the crystals their blue appearance. On heating, this water is driven off, producing anhydrous copper sulphate, CuSO4, which is white. The change is not caused by release of oxygen, copper metal, or sulphur dioxide. Adding water can restore the blue hydrated form, so A is correct.

Related tags

Copper SulphateWater Of CrystallisationSaltsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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