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Names | |||
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IUPAC name
Hexafluorophosphoric acid
[2]
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Other names
Hydrogen hexafluorophosphate
Hydron hexafluorophosphate | |||
Identifiers | |||
3D model (
JSmol)
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ChemSpider | |||
ECHA InfoCard | 100.037.263 | ||
EC Number |
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PubChem
CID
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CompTox Dashboard (
EPA)
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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
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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).
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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.
[3] Hexafluorophosphoric acid is only stable in solution, decomposing to HF and PF5 when dry.
[4] 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.
[5] 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.
[5]
Whereas a species with the formula HPF6 remains unknown, the analogous molecular hexafluoroarsenic acid (HAsF6) has been crystallized. [6]