Ammonium Chloride , chemical compound, NH 4 Cl, a white or colorless, odorless, water-soluble, cubic crystalline salt with a biting taste, commonly known as sal ammoniac.
 
It is prepared commercially by reacting ammonia , NH 3 , with hydrogen chloride, HCl, and is used chiefly in the manufacture of electric dry-cell batteries, in soldering fluxes, in textile printing, and in making other compounds.
 
It is also used in certain medical treatments. It occurs in nature in volcanic regions.