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Why does plaster of Paris harden 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 combines with water and re-forms gypsum, calcium sulphate dihydrate, CaSO₄·2H₂O. The newly formed interlocking gypsum crystals set into a hard mass, which is why the material is useful for casts and moulds. Thus option A is correct; no sodium chloride, carbon dioxide, or sugar is formed in this setting reaction.

Related tags

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

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