Question

Write the preparation of the following compound with balanced chemical equation:

Plaster of Paris

Answer 1

Plaster of Paris is a hemihydrate of calcium sulphate, CaSO₄ . H₂O. It is obtained by heating gypsum at 393 K.

\[\ce{\underset{\text{Gypsum}}{2CaSO4.2H2O_{(s)}} ->[\Delta] \underset{\text{Plaster of Paris}}{2CaSO4.H2O} + 3H2O}\]