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Why can overheating gypsum reduce its usefulness for preparing plaster of Paris?

Answer and explanation

Correct answer: Because control over water of crystallisation can be disturbed

Plaster of Paris is prepared by heating gypsum, CaSO4·2H2O, under controlled conditions so that part of its water of crystallisation is removed, producing CaSO4·½H2O. If gypsum is overheated, excessive water may be removed and anhydrous calcium sulphate can form. This material does not rehydrate and set in the desired way, so option C is correct; the other choices describe impossible changes.

Related tags

GypsumPlaster-Of-ParisControlled-HeatingWater-Of-CrystallisationClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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