Hydrofluoric acid

solution of hydrogen fluoride in water

Hydrofluoric acid (HF) is a solution of hydrogen fluoride in water.[2] Its chemical formula is HF. It is a very dangerous acid, being 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.

Hydrofluoric acid
Other names
fluoric acid; fluorhydric acid
  • 7664-39-3 ☒N
3D model (JSmol)
EC Number
  • 231-634-8
RTECS number
  • MW7875000
  • F
Molar mass not applicable
(see hydrogen fluoride)
Appearance Colorless solution
Density 1.15 g/mL (for 48% soln.)
Melting point not applicable
(see hydrogen fluoride)
Boiling point not applicable
(see hydrogen fluoride)
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 flammable
Related compounds
Other anions Hydrochloric acid
Hydrobromic acid
Hydroiodic acid
Related compounds Hydrogen fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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

Related pages change

References change

  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. Bibcode:2005JChPh.123r4501A. doi:10.1063/1.2090259. PMID 16292908.{{cite journal}}: CS1 maint: multiple names: authors list (link)

Other websites change