Show the decomposition of gypsum to P.O.P. and back interconversion of P.O.P. of gypsum.
The decomposition of gypsum to Plaster Of Paris is as follows:-
CaSO4.2H2O 
CaSO4.1/2H2O
Plaster of Paris is prepared by decomposing gypsum at 373K.
Interconversion of Plaster Of Paris into gypsum is as follows:-
CaSO4.1/2H2O + 1
H2O 
CaSO4.2H2O
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