Triflic acid

Triflic acid
Names
	IUPAC name Trifluoromethanesulfonic acid
	Other names Triflic acid
Identifiers
CAS Number	1493-13-6 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:48511 ;
ChemSpider	56192 ;
ECHA InfoCard	100.014.625
PubChem CID	62406;
UNII	JE2SY203E8 ;
CompTox Dashboard (EPA)	DTXSID70892979 DTXSID2044397, DTXSID70892979 ;
	InChI InChI=1S/CHF3O3S/c2-1(3,4)8(5,6)7/h(H,5,6,7) Key: ITMCEJHCFYSIIV-UHFFFAOYSA-N ; InChI=1/CHF3O3S/c2-1(3,4)8(5,6)7/h(H,5,6,7) Key: ITMCEJHCFYSIIV-UHFFFAOYAW;
	SMILES C(F)(F)(F)S(=O)(=O)O;
Properties
Chemical formula	CF3SO3H
Molar mass	150.07121 g/mol
Appearance	Colorless liquid
Density	1.696 g/mL
Melting point	−40 °C (−40 °F; 233 K)
Boiling point	162 °C (324 °F; 435 K)
Solubility in water	1600 g/L
Vapor pressure	3.2
Acidity (pKa)	−14.7±2.0
Conjugate base	Triflate anion
Viscosity	1.864–1.881 mm2/s at 20 °C
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Causes severe acid burns
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H290, H302, H314, H335, H402
Precautionary statements	P234, P261, P264, P270, P271, P273, P280, P301+P312+P330, P301+P330+P331, P303+P361+P353, P304+P340+P310, P305+P351+P338+P310, P363, P390, P403+P233, P405, P501
NFPA 704 (fire diamond)	4 0 2 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

Triflic acid, the short name for trifluoromethanesulfonic acid, TFMS, TFSA, HOTf or TfOH, is a sulfonic acid with the chemical formula CF₃SO₃H. It is one of the strongest known acids. Triflic acid is mainly used in research as a catalyst for esterification. It is a hygroscopic, colorless, slightly viscous liquid and is soluble in polar solvents.