Potassium bifluoride

Potassium bifluoride

Chembox new
Name = Potassium bifluoride
ImageFile =
ImageName =
IUPACName = Potassium bifluoride
OtherNames = Potassium hydrogen difluoride
Section1 = Chembox Identifiers
CAS = [7789-29-9]
RTECS = TS6650000
Section2 = Chembox Properties
Formula = HF2K
MolarMass = 78.10
Appearance = colourless solid
Density = 2.37 g/cm3, solid
Solubility =
MeltingPt = 239 °C
BoilingPt = decomp.
Section3 = Chembox Structure
Coordination =
CrystalStruct =
Section7 = Chembox Hazards
ExternalMSDS =
EUClass = Toxic (T), Corrosive (C)
RPhrases = R25-34
SPhrases = S22-26, S37-45
FlashPt = non flammable
Section8 = Chembox Related
OtherAnions = Potassium fluoride
OtherCations = Sodium bifluoride, ammonium bifluoride

Potassium bifluoride is the inorganic compound with the formula KHF2. This colourless salt consists of the potassium cation and the bifluoride (H2F-) anion. The salt is used in etchant for glass. Sodium bifluoride is related and is also of commercial use as an etchant as well as in cleaning products.Jean Aigueperse, Paul Mollard, Didier Devilliers, Marius Chemla, Robert Faron, Renée Romano, Jean Pierre Cuer, “Fluorine Compounds, Inorganic” in Ullmann’s Encyclopedia of Industrial Chemistry 2005 Wiley-VCH, Weinheim. DOI|10.1002/14356007.a11 307]

ynthesis and reactions

The salt was prepared by Edmond Frémy who decomposed it to generate, for the first time, hydrogen fluoride. Potassium bifluoride is prepared by treating potassium carbonate or potassium hydroxide with hydrofluoric acid::2 HF + KOH → KHF2 + H2OA related material containing two equivalents of HF is also known, KH2F3 (CAS#12178-06-2, m.p. 71.7 C). The industrial production of fluorine entails the electrolysis of molten KH2F3.

References


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