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What is the chemical name of plaster of Paris?

Answer and explanation

Correct answer: Calcium sulphate hemihydrate

Plaster of Paris is calcium sulphate hemihydrate, represented by CaSO₄·½H₂O, so option A is correct. It is prepared by carefully heating gypsum, CaSO₄·2H₂O, to remove part of its water of crystallisation. When water is added, it changes back to gypsum and sets into a hard mass. Sodium chloride, washing soda and calcium carbonate are different salts with different formulas and uses.

Related tags

Plaster Of ParisCalcium Sulphate HemihydrateGypsumAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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