Ammonium sulfate is an inorganic substance with chemical formula (NH4)2SO4, colorless crystal or white particles, and odorless. Decompose above 20℃. Solubility in water: 70.6g at 0℃ and 103.8g at 100℃. Insoluble in ethanol and acetone. 0.1mol/L aqueous solution has a pH of 5.5. The relative density is 1.77. The refractive index is 1.521. Ammonium sulfate is mainly used as fertilizer and is suitable for all kinds of soils and crops. It can also be used in textile, leather and medicine.