Super Acids

A superacid is an acid with an acidity greater than that of 100% pure sulfuric acid, which has a Hammett acidity function (H0) of −12. Commercially available superacids include Trifluoromethanesulfonic acid(CF3SO3H), also known as triflic acid, and Fluorosulfonic acid(FSO3H), both of which are about a thousand times stronger (i.e. have more negative H0 values) than sulfuric acid. The strongest superacids are prepared by the combination of two components, a strong Lewis acid and a strong Brønsted acid. The strongest known superacid is Fluoroantimonic acid.