Fluoroboric acid
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Fluoroboric acid or tetrafluoroboric acid (archaically, fluoboric acid) is an inorganic compound with the simplified chemical formula H+[BF4]−. Solvent-free tetrafluoroboric acid (H[BF4]) has not been reported. The term "fluoroboric acid" usually refers to a range of compounds including hydronium tetrafluoroborate ([H3O]+[BF4]−), which are available as solutions. The ethyl ether solvate is also commercially available, where the fluoroboric acid can be represented by the formula [H((CH3CH2)2O)n]+[BF4]−, where n is 2.
Hydronium tetrafluoroborate | |||
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Names | |||
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Preferred IUPAC name
Tetrafluoroboric acid[1] | |||
Other names
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Identifiers | |||
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3D model (JSmol) |
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ChEBI | |||
ChemSpider |
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ECHA InfoCard | 100.037.165 | ||
EC Number |
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21702 | |||
MeSH | Fluoroboric+acid | ||
PubChem CID |
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RTECS number |
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UNII | |||
UN number | 1775 | ||
CompTox Dashboard (EPA) |
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Properties | |||
H[BF4] | |||
Molar mass | 87.81 g·mol−1 | ||
Appearance | Colourless liquid | ||
Melting point | −90 °C (−130 °F; 183 K) | ||
Boiling point | 130 °C (266 °F; 403 K) | ||
Acidity (pKa) | ~1.8 (MeCN solution)[2] | ||
Hazards | |||
GHS labelling: | |||
Danger | |||
H314 | |||
P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501 | |||
NFPA 704 (fire diamond) | |||
Safety data sheet (SDS) | External MSDS | ||
Related compounds | |||
Related compounds |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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It is mainly produced as a precursor to other fluoroborate salts.[3] It is a strong acid. Fluoroboric acid is corrosive and attacks the skin. It is available commercially as a solution in water and other solvents such as diethyl ether. It is a strong acid with a weakly coordinating, non-oxidizing conjugate base.[2] It is structurally similar to perchloric acid, but lacks the hazards associated with oxidants.