Ammonium Sulphate, also referred to as diammonium sulphate or sulfuric acid diammonium salt, is a crystalline white solid with a salty taste and no smell. Water dissolves the compound easily, but alcohol and acetone do not. Due to its ability to absorb water, any damp surfaces will develop scabs. (NH4)2SO4 is the chemical formula for ammonium sulphate. The reaction between ammonium sulphate and alkaline substances produces ammonia gas.