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What happens to Plaster of Paris when water is added?

Answer and explanation

Correct answer: It hardens to form gypsum

Plaster of Paris, CaSO₄·½H₂O, reacts with water to form gypsum, CaSO₄·2H₂O. Interlocking gypsum crystals make the material set and become hard. It does not dissolve completely or produce a gas. Exam tip: Remember that Plaster of Paris hardens on adding water, so it is used for casts and moulds.

Related tags

Class 10 ScienceAcids Bases SaltsPlaster Of ParisGypsumSetting Reaction

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