Hydrofluoric acid

Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water. Solutions of HF are colorless, acidic and highly corrosive. It is used to make most fluorine-containing compounds; examples include the commonly used pharmaceutical antidepressant medication fluoxetine (Prozac) and the material PTFE (Teflon). Elemental fluorine is produced from it. It is commonly used to etch glass and silicon wafers.

Hydrofluoric acid
Names
IUPAC name
Fluorane
Other names
Fluorhydric acid
Hydronium fluoride
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
EC Number
  • 231-634-8
RTECS number
  • MW7875000
UNII
  • InChI=1S/FH/h1H Y
    Key: KRHYYFGTRYWZRS-UHFFFAOYSA-N Y
  • InChI=1/FH/h1H
    Key: KRHYYFGTRYWZRS-UHFFFAOYAC
  • F
  • [F-].[OH3+]
Properties
HF (aq)
Appearance Colorless liquid
Density 1.15 g/mL (for 48% soln.)
Acidity (pKa) 3.17
Hazards
GHS labelling:
Danger
H280, H300, H310, H314, H330
P260, P262, P264, P270, P271, P280, P284, P301+P310, P301+P330+P331, P302+P350, P303+P361+P353, P304+P340, P305+P351+P338, P310, P320, P321, P322, P330, P361, P363, P403+P233, P405, P410+P403, P501
NFPA 704 (fire diamond)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references
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