Question

State the common and chemical names of the compound formed when plaster of Paris is mixed with water.

Answer 1

When plaster of Paris is mixed with water, it settles into a hard mass to form gypsum (common name). The chemical name of gypsum is calcium sulphate dihydrate.
${\mathrm{CaSO}}_4.\frac{1}{2}{\mathrm{H}}_2\mathrm{O}+1\frac{1}{2}{\mathrm{H}}_2\mathrm{O}\underset{}{\to \mathrm{Ca}}{\mathrm{SO}}_4.2{\mathrm{H}}_{2}0$