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The plaster of paris should be stored in the moister proof container as it absorbs water from moisture and turns in to hard substance (gypsum)
CaSO4.1/2 H2O(plaster of paries) +1 1/2 H2O----> CaSO4.2H20
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POP(plaster of paris) should be stored in tight packs because it forms gypsum when moisture is there.
CaSO4.1/2H2O + 1 1/2 H2O ----------> CaSO4.2H2O
pop is formed when gypsum is heated at 373K.
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