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Gypsum forms plaster of Paris on controlled heating. What problem can occur on excessive heating?

Answer and explanation

Correct answer: Too much water may be removed and useful hemihydrate form may be spoiled

Gypsum is calcium sulfate dihydrate, CaSO4·2H2O. Controlled heating removes one and a half molecules of water to form plaster of Paris, calcium sulfate hemihydrate, CaSO4·1/2H2O. Excessive heating can remove the remaining water and produce anhydrous calcium sulfate, which does not set properly with water. Thus option A is correct.

Related tags

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

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