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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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Plaster of Paris (POP) should be stored in a moisture-proof container because Plaster of Paris is a powdery mass and absorbs water (moisture) to form a hard solid known as gypsum.
`{:(CaSO_(4).(1)/(2)H_(2)O,+,1(1)/(2)H_(2)Orarr,CaSO_(4).2H_(2)O),("[Plaster of Paris (POP)]",,,"Gypsum (Hard solid)"):}`
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