gypsum heat ............+ 3/2 H2O
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When gypsum is heated at 373k , we get plaster of paris [ Calcium Sulphate hemi hydrated salt]
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CaSO4.2H2O ( gypsum) [ on heating at 373 kelvin temperature] = CaSO4.1/2H2O ( P.O.P)+ 3/4 H2O
This is the chemical equation of the process through which plaster of Paris is made by heating gypsum at 373 kelvin temperature.
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