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Blue copper sulphate became white on heating and turned blue again on adding water. What was proved?

Answer and explanation

Correct answer: Water of crystallisation was related to the colour

The governing concept is water of crystallisation in hydrated salts. Blue copper sulfate crystals are CuSO4·5H2O. Heating removes this crystallisation water and produces white anhydrous CuSO4. Adding water restores the hydrated blue form. Hence the observation proves that the crystal water is associated with the colour, so option A is correct. Copper sulfate is neither sugar nor common salt, and water does not convert copper into gold.

Related tags

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

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