Triflic acid

CF₃SO₃H Molar mass150.07121 g/mol Appearance Colorless liquid Density1.696 g/mL Melting point−40 °C (−40 °F; 233 K) Boiling point162 °C (324 °F; 435 K)

Solubility in water

1600 g/L Vapor pressure3.2 Acidity (pK_a) −14.7±2.0Conjugate base Triflate anion Viscosity1.864–1.881 mm/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, P501NFPA 704 (fire diamond)

Related compounds

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

verify ( ?)

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 that is soluble in polar solvents. The acid is also the trifluorinated analogue of trichloromethanesulfonic acid.