Potassium hexafluorophosphate

Potassium hexafluorophosphate

Names
IUPAC name Potassium hexafluorophosphate
Identifiers
CAS Number	17084-13-8 N
3D model (Jmol)	Interactive image
ChemSpider	146640 Y
ECHA InfoCard	100.037.388
PubChem CID	23688904
InChI InChI=1S/F6P.K/c1-7(2,3,4,5)6;/q-1;+1 Y Key: YZDGRYDIGCWVND-UHFFFAOYSA-N Y 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)
Hazards
Main hazards	Toxic
R-phrases	R20, R21, R22, R34
S-phrases	S26, S27, S36, S37, S39, S45
NFPA 704	0 2 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
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:

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.