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Ammonium chloride (abbreviated as "ammonium chloride", also known as brine sand, chemical formula: NH4Cl) is a colorless cubic crystal or white crystalline powder. The taste is salty, cool and slightly bitter, acidic salt. The relative density is 1.527. Soluble in water and ethanol, soluble in liquid ammonia, insoluble in acetone and ether. The aqueous solution is weakly acidic, and the acidity is enhanced when heated. When heated to 100 °C, it begins to volatilize significantly, dissociates into ammonia and hydrogen chloride at 337.8 °C, and then resynthesizes to form ammonium chloride with very small particles after cooling, which is white smoke, which is not easy to sink and is not easy to dissolve in water. Heat to 350 °C for sublimation, boiling point 520 °C. It has low moisture absorption, but it can also absorb moisture and agglomerate in humid and rainy weather. It is corrosive to ferrous metals and other metals, especially to copper, and has no corrosive effect on pig iron.