Ammonium Sulfate is an inorganic salt. It is a very useful compound which is made by treating ammonia with sulfuric acid. Its chemical formula is (NH4)2SO4. Other Trading Names: Ammonium Tetraoxosulfate Ammonium Sulphate Diammonium Sulfate Sulfuric Acid Diammonium Salt Mascagnite Actamaster Dolamin (NH4)2SO4