Hydrofluoric acid

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Hydrofluoric acid
PubChem {{{value}}}
RTECS number MW7875000
SMILES {{{value}}}
Molar mass not applicable
(see hydrogen fluoride)
Appearance Colorless solution
Density 1.15 g/mL (for 48% soln.)
Melting point Template:Chembox CalcTemperatures
Boiling point Template:Chembox CalcTemperatures
Acidity (pKa) 3.15 [1]
EU classification Very toxic (T+)
Corrosive (C)
EU Index 009-003-00-1
NFPA 704
R-phrases R26/27/28, R35
S-phrases (S1/2), S7/9, S26, S36/37, S45
Flash point Non-flammable
Related compounds
Other anions Hydrochloric acid
Hydrobromic acid
Hydroiodic acid
Related compounds Hydrogen fluoride
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Hydrofluoric acid (HF) is a solution of hydrogen fluoride in water.[2] Its chemical formula is HF. It is a weak acid, but very corrosive and extremely toxic. It can dissolve glass to make hexafluorosilicic acid. If it gets on the skin, it can kill you. It is made by reacting fluorite with sulfuric acid. It is used in the processing of petroleum. It is also used to make various other chemicals containing fluorine, such as teflon (the coating in a frying pan), freon (the cooling agent in an air conditioner), and fluorocarbons (used as propellants in aerosol cans). It is used to clean metals. It is very toxic because it bonds with calcium ions in the body and makes them so they cannot be used. As an acid, it can be deprotonated to produce fluorides, which are also the salts of hydrofluoric acid.

If someone gets hydrofluoric acid on them, medical attention is needed, as just small amounts are very toxic.

Related pages


  1. Jolly W.L. (1984) Modern Inorganic Chemistry, McGraw-Hill, p.177
  2. Ayotte, P; Hébert, M; Marchand, P (Nov 2005). "Why is hydrofluoric acid a weak acid?". J. Chem. Phys. 123 (18): 184501. doi:10.1063/1.2090259. PMID 16292908. 

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