Question

Plaster of Paris should be stored in a moisture proof container .explain why with chemical equation

Answer 1

it will absorb water to form gypsum which set into hard solid mass this will make plaster of Paris useless after some time
caso4.1/2H2O+3/2H2O----- caso4.2H2O

Answer 2

Plaster of Paris should be stored in a moisture proof container.T his is because the presence of moisture can cause slow setting of plastered paris by bringing about its hydration.This will make the plaster of paris useless after some time.