Potassium fluoride

Potassium fluoride

chembox new
ImageFile = Potassium-fluoride-3D-ionic.png ImageSize =
IUPACName = Potassium fluoride
OtherNames =
Section1 = Chembox Identifiers
Abbreviations =
CASNo = 7789-23-3
EINECS =
InChI =
RTECS = TT0700000
Section2 = Chembox Properties
Formula = KF
MolarMass = 58.10
Appearance = colourless crystals
Density = 2.48 g/cm3
MeltingPt = 846 °C
BoilingPt = 1505 °C
Solubility in water = good
SolubleOther = HF
Solvent =
pKa =
Section7 = Chembox Hazards
EUClass =
EUIndex =
MainHazards =
NFPA-H = 3
NFPA-F =
NFPA-R =
NFPA-O =
RPhrases = 23/24/25
SPhrases = 26-45
RSPhrases =
FlashPt =
PEL =

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. [Vogel, A. I.; Leicester, J.; Macey, W. A. T. “n-Hexyl Fluoride” Organic Syntheses, Collected Volume 4, p.525 (1963). http://www.orgsyn.org/orgsyn/pdfs/CV4P0525.pdf] Such reactions usually employ polar solvents such as dimethyl formamide, ethylene glycol, and dimethyl sulfoxide. [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]

afety 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.

References

External links


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