Hexafluorophosphoric acid
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| Template:Longitem | HPF6 |
| Molar mass | 145.972 g/mol |
| Appearance | colorless oily liquid |
| Melting point | Template:Chembox CalcTemperatures |
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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 Template:Chem2, which also is written Template:Chem2.[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 (Template:Chem2) and hydrofluoric acid. Additionally, such solutions often contain products derived from hydrolysis of the P-F bonds, including Template:Chem2, Template:Chem2, and Template:Chem2, and their conjugate bases.[5] Hexafluorophosphoric acid attacks glass. Upon heating, it decomposes to generate HF. Crystalline Template:Chem/link has been obtained as the hexahydrate, wherein Template:Chem/link 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]
See also
References
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