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Fluoroboric acid

Fluoroboric acid
Canonical, skeletal formula of fluoroboric acid
Names
Preferred IUPAC name
Tetrafluoroboric acid
Other names
tetrafluoroboric acid, oxonium tetrafluoroboranuide, oxonium tetrafluoridoborate(1-)
Identifiers
3D model (Jmol)
ChEBI
ChemSpider
ECHA InfoCard 100.037.165
EC Number 240-898-3
21702
MeSH Fluoroboric+acid
PubChem CID
RTECS number ED2685000
UNII
UN number 1775
Properties
BF4H
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)
Hazards
Safety data sheet External MSDS
Corrosive C
R-phrases R34
S-phrases (S1/2), S26, S27, S45
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Related compounds
Related compounds
Hydrogen fluoride

Triflic acid

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YesYN ?)
Infobox references

Triflic acid

Fluoroboric acid or tetrafluoroboric acid is an inorganic compound with the chemical formula H
3
OBF
4
.

It is mainly produced as a precursor to other fluoroborate salts. 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. It is structurally similar to perchloric acid, but lacks the hazards associated with oxidants.

Although the solvent-free HBF4 has not been isolated, its solvates are well characterized. These salts consist of protonated solvent as a cation, e.g., H3O+ and H
5
O+
2
, and the tetrahedral BF
4
anion. The anion and cations are strongly hydrogen-bonded.

Aqueous solutions of HBF4 are produced by dissolving boric acid in aqueous hydrofluoric acid. Three equivalents of HF react to give the intermediate boron trifluoride and the fourth gives fluoroboric acid:

Anhydrous solutions can be prepared by treatment of aqueous fluoroboric acid with acetic anhydride.


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