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Names | |||
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IUPAC name
Sulfurofluoridic acid
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Systematic IUPAC name
Fluorosulfuric acid[citation needed] | |||
Other names
Fluorosulfonic acid,
Fluorosulphonic acid, Fluorinesulfonic acid, Fluorinesulphonic acid, Fluoridosulfonic acid, Fluoridosulphonic acid, Sulfuric fluorohydrin, Epoxysulfonyl fluoride | |||
Identifiers | |||
3D model (JSmol)
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ChemSpider | |||
ECHA InfoCard | 100.029.227 | ||
EC Number |
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MeSH | Fluorosulfonic+acid | ||
PubChem CID
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RTECS number |
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UNII | |||
UN number | 1777 | ||
CompTox Dashboard (EPA)
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Properties | |||
FHO3S | |||
Molar mass | 100.06 g·mol−1 | ||
Appearance | Colorless liquid | ||
Density | 1.726 g cm−3 | ||
Melting point | −87.5 °C; −125.4 °F; 185.7 K | ||
Boiling point | 165.4 °C; 329.6 °F; 438.5 K | ||
Acidity (pKa) | -10 | ||
Conjugate base | Fluorosulfate | ||
Structure | |||
Tetragonal at S | |||
Tetrahedral at S | |||
Hazards | |||
GHS labelling: | |||
Danger | |||
H314, H332[1] | |||
P261, P271, P280, P303+P361+P353, P304+P340+P310, P305+P351+P338[1] | |||
NFPA 704 (fire diamond) | |||
Safety data sheet (SDS) | ICSC 0996 | ||
Related compounds | |||
Related compounds
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Antimony pentafluoride Trifluoromethanesulfonic acid Hydrofluoric acid Sulfurous acid Sulfuric acid Sulfur hexafluoride | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Fluorosulfuric acid (IUPAC name: sulfurofluoridic acid) is the inorganic compound with the chemical formula HSO3F. It is one of the strongest acids commercially available. It is a tetrahedral molecule and is closely related to sulfuric acid, H2SO4, substituting a fluorine atom for one of the hydroxyl groups. It is a colourless liquid, although commercial samples are often yellow.[2]