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Plaster of Paris should be stored in a m...

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

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In the presence of moisture, Plaster of Paris gets hydrated and changes to Gypsum which is a hard mass.
`underset("Plaster of Paris")(CaSO_(4).1//2H_(2)O+)3//2H_(2)Otounderset("Gypsum")(CASO_(4))2H_(2)O`
It can be no longer be used for making moulds and statues. Therefore, Plaster of Parise is kept in moisture proof containers or bags.
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