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What does plaster of Paris change into when water is added to it?

Answer and explanation

Correct answer: Gypsum

Plaster of Paris, calcium sulfate hemihydrate \,\(\mathrm{CaSO_4\cdot\tfrac{1}{2}H_2O}\), reacts with water to form gypsum, calcium sulfate dihydrate \,\(\mathrm{CaSO_4\cdot2H_2O}\), and hardens. Common salt is sodium chloride, so it is not formed in this reaction.

Related tags

ScienceClass 10Acids Bases SaltsPlaster Of ParisGypsumHydration Reaction

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