Question

A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water :

(a) Identify the compound X

(b) Write the chemical equation for its preparation

(c) For what purpose is it used in hospitals?

Answer 1

(a) Plaster of Paris.

(b) $\underset{\text{Gypsum}}{CaS{O}_4.2H_{2}O}\stackrel{373K}{\to }\underset{\text{Plaster of Paris}}{CaS{O}_4.\frac{1}{2}{H}_{2}O}+\frac{3}{2}{H}_{2}O$

(c) It is used in hospitals for fixing fractures, supporting the bones in the right position.