Potassium chloride is an inorganic chloride with the chemical formula KCI and a molecular weight of 74.55. It is usually a colorless cubic crystal. The melting point is 790 ℃, the boiling point is 1500 ℃, and the density is 1.988g/cm3. Has hygroscopicity and is prone to clumping. Easy to dissolve in water, solubility increases with temperature, aqueous solution is neutral and has a salty taste. Slightly soluble in glycerol, slightly soluble in ethanol, insoluble in ether, concentrated hydrochloric acid, and acetone. It can undergo displacement reaction with metallic sodium at a high temperature of 850 ℃, and react with concentrated sulfuric acid to produce potassium bisulfate and hydrogen chloride.

physical property

Appearance and characteristics: White crystals, extremely salty taste, odorless and non-toxic. Easy to dissolve in water and glycerol, slightly soluble in alcohol, insoluble in ether, acetone, and hydrochloric acid [7]. Has hygroscopicity and is prone to clumping; The solubility in water increases rapidly with the increase of temperature, and often undergoes double decomposition with sodium salts to generate new potassium salts.

Refractive index: 1.334

Water solubility: 342g/L (20 º C)

Stability: Stable. Incompatible with strong oxidants and strong acids. moisture-proof. Moisture absorption.

Storage conditions: 2-8 º C

chemical property

The properties are basically the same as sodium chloride, and potassium chloride can be used as a raw material for industrial preparation of metallic potassium. This is a reversible reaction, which is thermodynamically favorable for the reversible reaction to proceed. When potassium reaches the boiling point temperature of 774 ℃, it becomes potassium vapor and overflows, which is beneficial for the reaction direction to shift to the right。