Chemistry:Potassium hexafluorophosphate

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Potassium hexafluorophosphate
Potassium hexafluorophosphate.png
IUPAC name
Potassium hexafluorophosphate
3D model (JSmol)
EC Number
  • 241-143-0
Molar mass 184.0625 g/mol
Appearance colourless solid
Density 2.75 g/cm3
Melting point 575 °C (1,067 °F; 848 K)
8.35g/100 mL (25 °C)[1]
Main hazards Toxic
GHS pictograms GHS05: CorrosiveGHS07: Harmful
GHS Signal word Danger
H302, H314, H319
P260, P264, P270, P280, P301+312, P301+330+331, P303+361+353, P304+340, P305+351+338, P310, P321, P330, P337+313, P363, P405, P501
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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Potassium hexafluorophosphate is the chemical compound with the formula KPF6. This colourless salt consists of potassium cations and hexafluorophosphate anions. It is prepared by the reaction:[2]

PCl5 + KCl + 6 HF → KPF6 + 6 HCl

This exothermic reaction is conducted in liquid hydrogen fluoride. The salt is stable in hot alkaline aqueous solution, from which it can be recrystallized. The sodium and ammonium salts are more soluble in water whereas the rubidium and caesium salts are less so.

KPF6 is a common laboratory source of the hexafluorophosphate anion, a non-coordinating anion that confers lipophilicity to its salts. These salts are often less soluble than the closely related tetrafluoroborates.


  1. Sarmousakis, J. N.; Low, M. J. D. "The Solubility of Potassium Hexafluorophosphate in Water" Journal of the American Chemical Society 1955, 77, 6518. doi:10.1021/ja01629a031
  2. Woyski, M. M.; Shenk, W. J.; Pellon, E. R. (1950). "Hexafluophosphates of Sodium, Ammonium, and Potassium". Inorganic Syntheses. 3. 111–117. doi:10.1002/9780470132340.ch29. ISBN 978-0-470-13234-0.