Question

What is the process of formation of P.O.P (plaster of paris) and also give its formula.

Answer 1

Plaster of Paris (Calcium Sulphate Hemihydrate, $CaSO_4.\frac{1}{2}H_2O$.is prepared by heating Gypsum (Calcium Sulphate, $CaSO_4.2H_2O$) to 120°C - 180°C.

$CaSO_4.2H_2O{ {----------->}\atop{393K - 453K} }CaSO_4.\frac{1}{2}H_2O$

Answer 2

hey dear....!!!

when gypsum is heated to a temperature of 100° C, it loses the three - fourths of its water of crystallization and forms of plaster of Paris or
P. O. P.

the formula of plaster of Paris is
CaSO 4.1/2H2O.

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