Potassium hexafluorophosphate

Summary

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]

Potassium hexafluorophosphate
Potassium hexafluorophosphate.png
Names
IUPAC name
Potassium hexafluorophosphate
Identifiers
  • 17084-13-8 checkY
3D model (JSmol)
  • Interactive image
ChemSpider
  • 146640 checkY
ECHA InfoCard 100.037.388 Edit this at Wikidata
EC Number
  • 241-143-0
  • 23688904
UNII
  • 88W436PDI9 checkY
  • DTXSID50884958 Edit this at Wikidata
  • InChI=1S/F6P.K/c1-7(2,3,4,5)6;/q-1;+1 checkY
    Key: YZDGRYDIGCWVND-UHFFFAOYSA-N checkY
  • InChI=1/F6P.K/c1-7(2,3,4,5)6;/q-1;+1
    Key: YZDGRYDIGCWVND-UHFFFAOYAC
  • [K+].F[P-](F)(F)(F)(F)F
Properties
K[PF6]
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]
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Toxic
GHS labelling:
GHS05: CorrosiveGHS07: Exclamation mark
Danger
H302, H314, H319
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)
2
0
0
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
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.

ReferencesEdit

  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). Hexafluorophosphates of Sodium, Ammonium, and Potassium. Inorg. Synth. Inorganic Syntheses. Vol. 3. pp. 111–117. doi:10.1002/9780470132340.ch29. ISBN 978-0-470-13234-0.