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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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The plaster of paris should be stored in a moisture-proof container as it absorbs water from moisture ans turns into a hard substance (Gypsum ) as shown in following chemical equation.
` CaSO_4(1)/(2) H_2O +(1)/(2) H_2O overset ( "Heat") to CaSO_42H_2O `
Plaster of paris
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