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Benzenesulfonic acid is the simplest aromatic sulfonic acid. It is highly water-soluble and a strong acid with a pKa of –2.8. It has been known since at least the 1880s; its synthesis, which goes back to 1916, is via the reaction of benzene with hot concentrated sulfuric acid.
Benzenesulfonic acid is used to produce phenol by fusing it with sodium hydroxide or hydrolyzing one of its salts, usually sodium. Other uses include surfactants made with its metal or amine salts and as a counterion for cationic pharmaceuticals.
For additional information on benzenesulfonic acid’s properties and uses, see articles curated by ScienceDirect.
Learn more about this molecule from CAS, the most authoritative and comprehensive source for chemical information.