how did gypsum change into plaster of paris?
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Gypsum turns pop By adding H2o in it
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When gypsum is heated to a temperature of 100 degree C, it loses three-fourth of its water of crystallization and change into plaster of Paris.
CaSO4.2H2O ------------: CaSO4.1/2H2O + 1 1/2 H2O
CaSO4.2H2O ------------: CaSO4.1/2H2O + 1 1/2 H2O
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