why does plaster of paris should be kept in a tight manner
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plaster of paris when kept in the presence of moisture, reacts with water present in moisture and forms GYPSUM which is a hard substance. if it forms then plaster of paris becomes useless.
thank u. comment below for changes to answer better next time
thank u. comment below for changes to answer better next time
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BCOZ THIS REACTS WITH MOISTURE IN THE AIR TO FORM GYPSUM WHICH IS AN HARD MASS.
CaSO₄.1/2 H₂O +1 1/2H₂O⇒CaSO₄.2H₂O
CaSO₄.1/2 H₂O +1 1/2H₂O⇒CaSO₄.2H₂O
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