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Potassium hexafluorophosphate
Potassium hexafluorophosphate.png
IUPAC name
Identifiers
CAS number 17084-13-8
PubChem 23688904
Properties
Molecular formula F6KP
Molar mass 184.0625 g/mol
Appearance colourless solid
Density 2.75 g/cm3
Melting point

575 °C

Solubility in water 0.432M (25 °C)
Hazards
Main hazards toxic
NFPA 704
NFPA 704.svg
0
2
0
 
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

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: [1]

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. It salts are often less soluble than the closely related tetrafluoroborates.

References

  1. ^ Woyski, M. M. (1950). "Hexafluorophosphates of Sodium, Ammonium, and Potassium". Inorg. Synth. 3: 111–117. doi:10.1002/9780470132340.ch29.  
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