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When water is added to plaster of Paris, into which substance does it harden?

Answer and explanation

Correct answer: Gypsum

Plaster of Paris is calcium sulphate hemihydrate, written as CaSO₄·½H₂O. When water is added, it combines with the required water and changes into calcium sulphate dihydrate, CaSO₄·2H₂O, which is gypsum. The formation of the harder solid explains its use for casts and moulds. Therefore option A is correct. Washing soda, baking soda and bleaching powder are different salts and are not produced in this hydration reaction.

Related tags

Plaster Of ParisGypsumHydrationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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