These are instructions for preparing ammonia gas (NH3) from ammonium chloride and calcium hydroxide in water.
ammonium chloride (NH4Cl)
calcium hydroxide Ca(OH)2
Gently heat a mixture of ammonium chloride and calcium hydroxide in water. Collect the ammonia from the upward displacement of air in a hood.
Ca(OH)2 + 2NH4Cl → 2NH3 + CaCl2 + 2H2O