Potassium fluoride, salt, also be called potassium fluoride salt. White monoclinic or crystalline powder. Taste salty. Easy to absorb moisture. Soluble in water, insoluble in ethanol. The aqueous solution is alkaline and can corrode glass and porcelain. The relative density of 2.454. Melting point 858 ° C. Medium toxic, half lethal dose (rat, oral) 245mg / kg. Irritating.

Potassium fluoride physical properties:

Appearance and character: colorless cubic crystal, easy deliquescence.

Melting point (° C): 858

Relative density (water = 1): 2.48

Boiling point (° C): 1505

Molecular formula: KF

Molecular weight: 58.10

Saturated vapor pressure (kPa): 133.3 Pa (885 °C)

Solubility: soluble in water, hydrofluoric acid, liquid ammonia, insoluble in alcohol.

Water solubility: 44.7 g / 0 °C; 53.5 g / 10 °C; 94.9 g / 20 °C; 108 g / 30 °C; 138 g / 40 °C; 142 g / 60 °C;

Single Isotope Mass: 57.96211 Da

Nominal Mass: 58 Da

Average Quality: 58.0967 Da

Potassium fluoride chemical properties:

(1) Basic nature

Soluble in water, soluble in hydrofluoric acid and liquid ammonia, slightly soluble in alcohol and acetone. The aqueous solution is alkaline and can corrode glass and porcelain. Heating to sublimation temperature when a little decomposition, but the activity of molten potassium fluoride is large, can corrode refractory material. And hydrogen peroxide can form adduct KF · H2O2. There are two hydrates: KF · 2H2O and KF · 4H2O. Below 40.2 ℃, the aqueous solution can be crystallized to get dihydrate (KF · 2H2O), monoclinic crystal, 41 ℃ can be self-soluble in water. poisonous.

(2) Stability

Reaction with the acid release of corrosive, more irritating hydrofluoric acid, can corrode the glass.