"sulfonic acid." YourDictionary, n.d. Web. 08 December 2018. <https://www.yourdictionary.com/sulfonic-acid>.
sulfonic acid. (n.d.). Retrieved December 08th, 2018, from https://www.yourdictionary.com/sulfonic-acid
Any of several acids containing the group SO3H attached to an organic radical. Sulfonic acids and their salts are important in industry as catalysts in organic synthesis and in making sulfonamide drugs, detergents, and dyes.