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Why can prolonged strong heating of gypsum form more anhydrous calcium sulphate instead of plaster of Paris?

Answer and explanation

Correct answer: Because more water can be removed

Gypsum is calcium sulphate dihydrate, CaSO₄·2H₂O, so it contains water of crystallisation. Controlled heating removes part of this water and produces plaster of Paris, CaSO₄·½H₂O: CaSO₄·2H₂O → CaSO₄·½H₂O + 1½H₂O. If heating is too strong or prolonged, still more water is removed and anhydrous calcium sulphate, CaSO₄, can form. The other options introduce substances or products not involved. Therefore 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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