In the laboratory, ammonia is made by heating the ammonium chloride with a quenched lime.
2NH4Cl + Ca(OH)2 → CaCl2 + 2H2O + 2NH3
In a rigid glass tube, a mixture of ammonium and quenched lime is heated. The received ammonia gas is collected from the gas jar by downward displacement of air.
Before being collected in a gas jar, it is passed onto CaO, which removes the moisture of this gas.