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Why does plaster of Paris become hard when water is added?

Answer and explanation

Correct answer: It changes into gypsum

Plaster of Paris is calcium sulphate hemihydrate, CaSO₄·½H₂O. When water is added, it rehydrates and changes back into gypsum, calcium sulphate dihydrate, CaSO₄·2H₂O. The re-formed crystals interlock and make the material set into a hard mass, so option A is correct. It does not form sodium chloride, turn into a gas, or produce sugar.

Related tags

Plaster Of ParisGypsumSetting ReactionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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