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What can happen to setting if too much water is used while making a plaster of Paris statue?

Answer and explanation

Correct answer: Setting may become weak and slow

Plaster of Paris is calcium sulfate hemihydrate, CaSO₄·½H₂O. On adding water, it rehydrates and sets into gypsum, CaSO₄·2H₂O. A correct amount of water permits this reaction and gives a workable paste. Excess water makes the mixture too dilute; after setting, the extra water leaves pores and reduces strength, while the diluted paste may set less effectively. Therefore option A is correct.

Related tags

Plaster Of ParisGypsumSettingAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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