Hexafluorophosphoric acid

Hexafluorophosphoric acid
Names
	IUPAC name Hexafluorophosphoric acid
	Other names Hydrogen hexafluorophosphate; Hydron hexafluorophosphate
Identifiers
CAS Number	16940-81-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	17339451 ;
ECHA InfoCard	100.037.263
EC Number	241-006-5;
PubChem CID	16211447;
CompTox Dashboard (EPA)	DTXSID40884947 ;
	InChI InChI=1S/F6P/c1-7(2,3,4,5)6/q-1/p+1 Key: LJQLCJWAZJINEB-UHFFFAOYSA-O ; InChI=1/F6P/c1-7(2,3,4,5)6/q-1/p+1 Key: LJQLCJWAZJINEB-IKLDFBCSAL;
	SMILES [H+].F[P-](F)(F)(F)(F)F;
Properties
Chemical formula	HPF6
Molar mass	145.972 g/mol
Appearance	colorless oily liquid
Melting point	decomposes at 25 °C
Solubility in water	exists only in solution
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Corrosive
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H311, H314, H330
Precautionary statements	P260, P264, P271, P280, P284, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P320, P321, P363, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Hexafluorophosphoric acid refers to a family of salts produced by combining phosphorus pentafluoride and hydrofluoric acid. The idealized chemical formula for hexafluorophosphoric acid is HPF₆, which also is written H[PF]₆. Hexafluorophosphoric acid is only stable in solution, decomposing to HF and PF₅ when dry. It exothermically reacts with water to produce oxonium hexafluorophosphate (H₃OPF₆) and hydrofluoric acid. Additionally, such solutions often contain products derived from hydrolysis of the P-F bonds, including HPO
₂F
₂, H
₂PO
₂F, and H
₃PO
₄, and their conjugate bases. Hexafluorophosphoric acid attacks glass. Upon heating, it decomposes to generate HF. Crystalline HPF
₆ has been obtained as the hexahydrate, wherein PF⁻
₆ is enclosed in truncated octahedral cages defined by the water and protons. NMR spectroscopy indicates that solutions derived from this hexahydrate contain significant amounts of HF.

Whereas a species with the formula HPF₆ remains unknown, the analogous molecular hexafluoroarsenic acid (HAsF₆) has been crystallized.

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