Potassium hexafluorophosphate

Potassium hexafluorophosphate
Names
IUPAC name
Potassium hexafluorophosphate
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.037.388
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;+1 checkY
    Key: YZDGRYDIGCWVND-UHFFFAOYSA-N checkY
  • InChI=1/F6P.K/c1-7(2,3,4,5)6;/q-1;+1
    Key: YZDGRYDIGCWVND-UHFFFAOYAC
SMILES
  • [K+].F[P-](F)(F)(F)(F)F
Properties
Chemical formula
 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)
Solubility in water
 8.35g/100 mL (25 °C)[1]
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 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

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:[2]

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.

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. {{cite book}}: ISBN / Date incompatibility (help)
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