Potassium hexafluorophosphate

Potassium hexafluorophosphate
Names
	IUPAC name Potassium hexafluorophosphate
Identifiers
CAS Number	17084-13-8 ;
3D model (JSmol)	Interactive image;
ChemSpider	146640 ;
ECHA InfoCard	100.037.388
EC Number	241-143-0;
PubChem CID	23688904;
UNII	88W436PDI9 ;
CompTox Dashboard (EPA)	DTXSID50884958 ;
	InChI InChI=1S/F6P.K/c1-7(2,3,4,5)6;/q-1;+1 Key: YZDGRYDIGCWVND-UHFFFAOYSA-N ; 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
	GHS labelling:
Pictograms
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)	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 the chemical compound with the formula KPF₆. This colourless salt consists of potassium cations and hexafluorophosphate anions. It is prepared by the reaction:^[2]

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.

References[]

^ 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
^ Woyski, M. M.; Shenk, W. J.; Pellon, E. R. (1950). Hexafluorophosphates of Sodium, Ammonium, and Potassium. Inorg. Synth. Inorganic Syntheses. 3. pp. 111–117. doi:10.1002/9780470132340.ch29. ISBN 978-0-470-13234-0.

[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. 3. pp. 111–117. doi:10.1002/9780470132340.ch29. ISBN 978-0-470-13234-0.

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