(NH4)2CO3 is the chemical formula of ammonium carbonate, a chemical compound with a molar mass of 96.09 grams per mole. Its density is 1.50 grams per cubic centimeter. It is normally soluble in water, but it decomposes in hot water.
Ammonium carbonate is industrially obtained from ammonia, NH3, and carbon dioxide, CO2. It spontaneously decomposes to form ammonium bicarbonate, NH4HCO3, and ammonia. It is used in cooking as a leavening agent in northern Europe and the Scandinavian countries, and it is used as an acidity regulator in the food industry, having the E number E503. It is also used in the pharmaceutical industry as a component of smelling salts and as an active ingredient of Buckley's cough syrup in Canada.