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Potassium hexafluorophosphate

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Potassium hexafluorophosphate
Names
IUPAC name Potassium hexafluorophosphate
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.037.388 Edit this at Wikidata
EC Number
  • 241-143-0
PubChem CID
UNII
CompTox Dashboard (EPA)
InChI
  • InChI=1S/F6P.K/c1-7(2,3,4,5)6;/q-1;+1Key: YZDGRYDIGCWVND-UHFFFAOYSA-N
  • InChI=1/F6P.K/c1-7(2,3,4,5)6;/q-1;+1Key: YZDGRYDIGCWVND-UHFFFAOYAC
SMILES
  • .F(F)(F)(F)(F)F
Properties
Chemical formula K
Molar mass 184.0625 g/mol
Appearance colourless solid
Density 2.75 g/cm
Melting point 575 °C (1,067 °F; 848 K)
Solubility in water 8.35g/100 mL (25 °C)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards Toxic
GHS labelling:
Pictograms GHS05: CorrosiveGHS07: Exclamation mark
Signal word Danger
Hazard statements H302, H314, H319
Precautionary statements P260, P264, P270, P280, P301+P312, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P330, P337+P313, P363, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2 0 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

Potassium hexafluorophosphate is a chemical compound with the formula KPF6. This colourless salt consists of potassium cations and hexafluorophosphate anions. It is prepared from phosphorus pentachloride:

PCl5 + KCl + 6 HF → KPF6 + 6 HCl

This exothermic reaction is conducted in liquid hydrogen fluoride. The salt is stable in a 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.

References

  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. Vol. 3. Inorg. Synth. pp. 111–117. doi:10.1002/9780470132340.ch29. ISBN 978-0-470-13234-0.
Potassium compounds
H, (pseudo)halogens
chalcogens
pnictogens
B, C group
transition metals
organic
Hexafluorophosphates
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