Hexafluorophosphoric acid

Hexafluorophosphoric acid
Names
IUPAC name
Hexafluorophosphoric acid
Other names
Hydrogen hexafluorophosphate
Hydron hexafluorophosphate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.037.263
EC Number
  • 241-006-5
  • InChI=1S/F6P/c1-7(2,3,4,5)6/q-1/p+1 N
    Key: LJQLCJWAZJINEB-UHFFFAOYSA-O N
  • InChI=1/F6P/c1-7(2,3,4,5)6/q-1/p+1
    Key: LJQLCJWAZJINEB-IKLDFBCSAL
  • [H+].F[P-](F)(F)(F)(F)F
Properties
HPF6
Molar mass 145.972 g/mol
Appearance colorless oily liquid
Melting point decomposes at 25 °C
exists only in solution
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Corrosive
GHS labelling:
Danger
H301, H311, H314, H330
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).
N verify (what is YN ?)
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[PF6]. Hexafluorophosphoric acid is only stable in solution, decomposing to HF and PF5 when dry. It exothermically reacts with water to produce oxonium hexafluorophosphate ([H3O]+[PF6]−) and hydrofluoric acid. Additionally, such solutions often contain products derived from hydrolysis of the P-F bonds, including HPO2F2, H2PO3F, and H3PO4, 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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