Potassium hexafluorophosphate
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]
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| IUPAC name
Potassium hexafluorophosphate | |
| Identifiers | |
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| ChemSpider | |
| ECHA InfoCard | 100.037.388  |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| 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) |
| 8.35g/100 mL (25 °C)[1] | |
| Hazards | |
| Main hazards | Toxic |
| R-phrases (outdated) | R20, R21, R22, R34 |
| S-phrases (outdated) | S26, S27, S36, S37, S39, S45 |
| NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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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.
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