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Why is plaster of Paris kept away from moisture in a closed container?

Answer and explanation

Correct answer: It can absorb moisture and change into gypsum

Plaster of Paris is calcium sulphate hemihydrate, CaSO4·1/2H2O. It reacts with water to form gypsum, CaSO4·2H2O: CaSO4·1/2H2O + 1 1/2H2O → CaSO4·2H2O. This hydration makes the material set and harden, so unwanted moisture can spoil its storage and handling properties. It does not form an acid, release chlorine, or produce sodium carbonate. Therefore A is correct.

Related tags

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

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