sulfanilic acid

sul′fa•nil′ic ac′id

(ˈsʌl fəˈnɪl ɪk, ˌsʌl-)

n. a grayish white, crystalline, slightly water-soluble solid, the para form of C₆H₇NO₃S, used chiefly as an intermediate in the manufacture of dyes. [1855–60; sulf- + anilic]

Thesaurus

Noun

sulfanilic acid - a crystalline acid made from aniline and used as a dyesulphanilic acidacid - any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt

Sulfanilic Acid

sulfanilic acid

[¦səl·fə¦nil·ik ′as·əd] (organic chemistry) C₆H₄NH₂·SO₃H·H₂O Combustible, grayish-white crystals slightly soluble in water, alcohol, and ether, soluble in fuming hydrochloric acid; chars at 280-300°C; used in medicine and dyestuffs and as a chemical intermediate.

Sulfanilic Acid

(or p-aminobenzenesulfonic acid), a colorless crystalline compound that decomposes at 280°–300°C. It is sparingly soluble in water; 1 g dissolves in 100 g of water at 20°C.

Sulfanilic acid is an inner salt, in which the amino group is neutralized by the sulfo group. Therefore, the acid does not form salts with mineral acids, but its sulfo group may be neutralized by

bases—for example, with the formation of the sodium salt H₂N—C₆H₄SO₃Na.

Sulfanilic acid is produced by heating aniline sulfate, C₆H₅NH₂·½H₂SO₄, at 180°–200°C. Diazotization of sulfanilic acid yields diazobenzenesulfonic acid, , which is widely used in the production of azo dyes. The amide of sulfanilic acid, H₂H—C₆H₄—SO₂NH₂ (sulfanilamide), is used in medicine, where it is called Streptocid album. Some of the derivatives of sulfanilamide, including Albucid, sulfonamide (Sul’gin), Sulfidine, sulfamethazine, and sulfazole, or sulfamethylthiazole, are also used in medicine. In the laboratory, sulfanilic acid is used for the determination of nitrites and the detection of several metals, such as osmium and ruthenium.

sulfanilic acid

sul′fa•nil′ic ac′id

Sulfanilic Acid

sulfanilic acid

Sulfanilic Acid

sulfanilic acid

Synonyms for sulfanilic acid

noun a crystalline acid made from aniline and used as a dye

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