Fluoroantimonic acid
Fluoroantimonic acid (pH −31.3) is a mixture of hydrogen fluoride and antimony pentafluoride, containing various cations and anions (the simplest being H
2F+
and Sb F−
6). This mixture is a superacid that, in terms of corrosiveness, is trillions of times stronger than pure sulfuric acid when measured by its Hammett acidity function. It even protonates some hydrocarbons to afford pentacoordinate carbocations (carbonium ions). Like its precursor hydrogen fluoride, it attacks glass, but can be stored in containers lined with PTFE (Teflon) or PFA.
Fluoroantimonic acid stored in a PFA bottle | |
| Names | |
|---|---|
| IUPAC name
Fluoroantimonic acid | |
| Systematic IUPAC name
Hexafluoroantimonic acid | |
Other names
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| Identifiers | |
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.037.279 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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SMILES
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| Properties | |
| Appearance | Colorless fuming liquid |
| Density | 2.885 g/cm3 |
| Boiling point | 40 °C (104 °F; 313 K) (decomposes) |
| Reacts explosively | |
| Solubility | SO2ClF, SO2 |
| Related compounds | |
Related acids |
Antimony pentafluoride Hydrogen fluoride Magic acid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
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