Hydrofluoric acid

Hydrofluoric acid (HF + H₂O ⇌ F^- + H₃O⁺)
Names
	IUPAC name Fluorane
	Other names Fluorhydric acid; Hydronium fluoride
Identifiers
CAS Number	7664-39-3 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:29228 ;
ChemSpider	14214 ;
EC Number	231-634-8;
PubChem CID	14917;
RTECS number	MW7875000;
UNII	RGL5YE86CZ ;
CompTox Dashboard (EPA)	DTXSID1049641 ;
	InChI InChI=1S/FH/h1H Key: KRHYYFGTRYWZRS-UHFFFAOYSA-N ; InChI=1/FH/h1H Key: KRHYYFGTRYWZRS-UHFFFAOYAC;
	SMILES F.O; [F-].[OH3+];
Properties
Chemical formula	HF (aq)
Appearance	Colorless liquid
Density	1.15 g/mL (for 48% soln.)
Acidity (pKa)	3.17
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H280, H300+H310+H330, H314
Precautionary statements	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)	4 0 0 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

Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water. Solutions of HF are colorless, acidic and highly corrosive. A common concentration is 49% (48–52%) but there are also stronger solutions (e.g. 70%) and pure HF has a boiling point near room temperature. It is used to make most organofluorine 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.