Potassium chloride (chemical formula: KCl), a kind of hydrochloride, white crystal or crystalline powder, easily soluble in water and glycerin, insoluble in alcohol, insoluble in ether and acetone.
Basic nature
Physical properties
CAS number 7447-40-7
EINECS No. 231-211-8
Relative density (solid): 1.98
Relative density (15℃ saturated aqueous solution): 1.172
Melting point: 770°C
Appearance: white crystal or crystalline powder
Boiling point: 1500℃ (partially will sublimate)
Solubility: 1g is soluble in 2.8ml water, 1.8ml boiling water, 14ml glycerin, about 250ml ethanol, insoluble in ether, acetone and hydrochloric acid. Magnesium chloride and sodium chloride can reduce its solubility in water.
Chemical nature
1. It can be replaced by a metal with a high melting point in a molten state
Na+KCl=High temperature=NaCl+K
2. Electrolysis
( 2KCl+2H2O) Electrolysis=2KOH+H2↑+Cl2↑
2KCl (melting) electrolysis = 2K+Cl2↑
3. Metathesis reaction
KCl+AgNO3=AgCl↓+KNO3
2KCl+H2SO4(concentrated)=2HCl↑+K2SO4 (principle: non-volatile acid to volatile acid)
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