Ammonium chloride

Summarize

Ammonium chloride (referred to as "ammonium chloride", also known as halogen sand, chemical formula: NH4Cl) is a colorless cubic crystal or white crystalline powder. The taste is salty, cool and slightly bitter, sour 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 increases when heated. It starts to volatilize significantly when heated to 100°C, and dissociates into ammonia and hydrogen chloride at 337.8°C, and recombines to form ammonium chloride with extremely small particles when it is cooled, showing white smoke, which is not easy to sink, and is extremely difficult to dissolve in water again. . Heating to 350 ° C sublimation, the boiling point of 520 ° C. It has low hygroscopicity, but it can also absorb moisture and agglomerate in wet and rainy weather. It is corrosive to ferrous metals and other metals, especially to copper, and has no corrosive effect on pig iron.

Decomposition temperature

It dissociates into ammonia and hydrogen chloride at 337.8°C, and recombines into ammonium chloride with very small particles when it is cooled, forming a white dense fog, which is not easy to sink, and is also extremely difficult to dissolve in water. It can be seen that the gas will react back to ammonium chloride.