5-Sulfosalicylic acid is strongly acidic in nature. It exists in various hydrated forms such as dihydrate, dideuterate, trihydrate and pentahydrate.
S 2787 (OTTO) 5-Sulphosalicylic acid, GR 99%+ Cas 5965-83-3 - used in the preparation of 1:1 proton-transfer organic adduct, 3-aminopyridinium 3-carboxy-4-hydroxybenzenesulfonate monohydrate and the anhydrous adduct.