Fluoroboric acid

Fluoroboric acid
	; Oxonium tetrafluoroborate
Oxonium ion	Tetrafluoroborate anion
Names
	Preferred IUPAC name Tetrafluoroboric acid
	Other names Fluoboric acid; Fluoroboric acid; Hydrogen tetrafluoroborate; Oxonium tetrafluoroboranuide; Oxonium tetrafluoridoborate(1-); Oxonium tetrafluoroborate;
Identifiers
CAS Number	14219-41-1 ([H3O]+[BF4]−) ; 16872-11-0 (solvent free) ; 80628-99-5 ([H5O2]+[BF4]−) ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:38902 ;
ChemSpider	26156 ;
ECHA InfoCard	100.037.165
EC Number	240-898-3;
Gmelin Reference	21702
MeSH	Fluoroboric+acid
PubChem CID	28118;
RTECS number	ED2685000;
UNII	H429WZ9FBQ ;
UN number	1775
CompTox Dashboard (EPA)	DTXSID8029739 ;
	InChI InChI=1S/BF4H/c2-1(3,4)5/h2H Key: YKRRMQXMWYXWJW-UHFFFAOYSA-N ;
	SMILES F[B-](F)(F)[FH+]; [H+].F[B-](F)(F)F;
Properties
Chemical formula	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)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501
NFPA 704 (fire diamond)	3 0 0
Safety data sheet (SDS)	External MSDS
Related compounds
Related compounds	Hydrogen fluoride; Triflic acid; Hexafluorophosphoric acid;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Fluoroboric acid or tetrafluoroboric acid (archaically, fluoboric acid) is an inorganic compound with the simplified chemical formula H⁺[B F₄]⁻. Unlike other strong acids like H₂SO₄ or HClO₄, the pure (solvent free) tetrafluoroboric acid (more precisely, pure hydrogen tetrafluoroborate H[BF₄]) does not exist. The term "fluoroboric acid" refers to a range of chemical compounds, depending on the solvent. The H⁺ in the simplified formula of fluoroboric acid represents the solvated proton. The solvent can be any suitable Lewis base. For instance, if the solvent is water, fluoroboric acid can be represented by the formula [H₃O]⁺[BF₄]⁻ (oxonium tetrafluoroborate), although more realistically, several water molecules solvate the proton: [H(H₂O)_n]⁺[BF₄]⁻. 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 most likely 2.

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.

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