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Potassium fluoride
IUPAC name
CAS number 7789-23-3 Yes check.svgY
PubChem 522689
EC number 232-151-5
RTECS number TT0700000
Molecular formula KF
Molar mass 58.0967 g/mol
Appearance colourless crystals
Density 2.48 g/cm3
Melting point

858 °C

Boiling point

1505 °C

Solubility in water 92 g/100 mL (18 °C)
Solubility soluble in HF
insoluble in alcohol
EU Index 009-005-00-2
EU classification Toxic (T)
R-phrases R23/24/25
S-phrases (S1/2), S26, S45
NFPA 704
NFPA 704.svg
Flash point Non-flammable
LD50 245 mg/kg (oral, guinea pig)
Related compounds
Other anions Potassium chloride
Potassium bromide
Potassium iodide
Other cations Lithium fluoride
Sodium fluoride
Rubidium fluoride
Caesium fluoride
 Yes check.svgY (what is this?)  (verify)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Potassium fluoride is the chemical compound with the formula KF. After hydrogen fluoride, KF is the primary source of the fluoride ion for applications in manufacturing and in chemistry. It is an alkali metal halide and occurs naturally as the rare mineral carobbiite. Aqueous solutions of KF will etch glass due to the formation of soluble fluorosilicates, although HF is more effective.

Applications in organic chemistry

In organic chemistry, KF is the preferred source of fluoride for the conversion of chlorocarbons into fluorocarbons.[1] Such reactions usually employ polar solvents such as dimethyl formamide, ethylene glycol, and dimethyl sulfoxide.[2]

Safety considerations

Like other sources of the fluoride ion, F, KF is poisonous, although lethal doses approach gram levels for humans. It is harmful by inhalation and ingestion, highly corrosive and skin contact may cause severe burns.


  1. ^ Vogel, A. I.; Leicester, J.; Macey, W. A. T., "n-Hexyl Fluoride", Org. Synth.,  ; Coll. Vol. 4: 525  
  2. ^ Han, Q.; Li, H-Y. "Potassium Fluoride" in Encyclopedia of Reagents for Organic Synthesis, 2001 John Wiley & Sons,New York. DOI: 10.1002/047084289X.rp214

Simple English

Potassium fluoride is a chemical compound. Its chemical formula is KF. It contains potassium and fluoride ions.



Potassium fluoride is a colorless crystalline solid. It rarely occurs in the ground. It dissolves easily in water. It can react with glass. Hydrofluoric acid is more effective at reacting with glass, though. It has to be stored in plastic or platinum containers.


Potassium fluoride is made by reacting potassium carbonate with hydrofluoric acid. This reaction can make potassium bifluoride. Potassium bifluoride is a mixture of hydrofluoric acid and potassium fluoride.


It is used because of its fluoride ion. It can be used to add fluoride ions to some chemical compounds.


Potassium fluoride is somewhat toxic. It is corrosive to glass. It can burn when spilled on skin.

See also

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