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Plaster of Paris should be stored in a moisture-proof container. Explain why?

Q 13.     Plaster of Paris should be stored in a moisture-proof container. Explain why?

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Plaster of Paris should be stored in a moisture-proof container because it absorbs moisture (or water) to form a hard substance called gypsum which makes Plaster of Paris useless.


CaSO_4.\frac{1}{2}H_2O+1\frac{1}{2}H_2O\rightarrow CaSO_4.2H_2O

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