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sulfonic acid
An organic compound of general formula RSO2OH. Sulfonic acids are strong, water-soluble acids often used as their sodium salts, sulfonates. Aromatic sulfonic acids are made by sulfonation with fuming sulfuric acid. They are used to make detergents, dyes, sulfa drugs, and ion-exchange resins. Sulfonic acids are useful in synthesis, since the sulfonate group is readily replaced.
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