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When gypsum is heated under controlled conditions, plaster of Paris is formed. How does the water content change?

Answer and explanation

Correct answer: Some water of crystallisation is removed

The governing concept is controlled dehydration of a hydrated salt. Gypsum is calcium sulfate dihydrate, CaSO₄·2H₂O. On careful heating, it loses only one and a half molecules of water per formula unit and forms calcium sulfate hemihydrate, CaSO₄·½H₂O, called plaster of Paris: CaSO₄·2H₂O → CaSO₄·½H₂O + 1½H₂O. Therefore option B is correct. Excessive heating can remove more water and affect the useful setting property.

Related tags

GypsumPlaster Of ParisWater Of CrystallisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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