N-Phenylsulfanilic Acid
Title: N-Phenylsulfanilic Acid
CAS Registry Number: 101-57-5
CAS Name: 4-(Phenylamino)benzenesulfonic acid
Additional Names: 4-diphenylaminesulfonic acid; p-anilinobenzenesulfonic acid
Molecular Formula: C12H11NO3S
Molecular Weight: 249.29
Percent Composition: C 57.82%, H 4.45%, N 5.62%, O 19.25%, S 12.86%
Literature References: Prepd by acetylation followed by sulfonation of diphenylamine: Merz, Weith, Ber. 6, 1512 (1873); Gnehm, Werdenberg, Z. Angew. Chem. 12, 1027 (1899); Sarver, Kolthoff, J. Am. Chem. Soc. 53, 1902 (1931).
Properties: Leaves. Becomes blue on exposure to light. Soluble in water, in alcohol. Insol in ether. Dec into diphenylamine and sulfuric acid when heated above 200° with water contg hydrochloric acid.
 
Derivative Type: Sodium salt
Molecular Formula: C12H10NNaO3S
Molecular Weight: 271.27
Percent Composition: C 53.13%, H 3.72%, N 5.16%, Na 8.47%, O 17.69%, S 11.82%
Properties: Very sol in water.
 
Derivative Type: Potassium salt
Molecular Formula: C12H10KNO3S
Molecular Weight: 287.38
Percent Composition: C 50.15%, H 3.51%, K 13.61%, N 4.87%, O 16.70%, S 11.16%
Properties: Leaves; slightly sol in alcohol, very sol in water.
 
Derivative Type: Barium salt
Molecular Formula: (C12H10NO3S)2Ba
Molecular Weight: 633.88
Percent Composition: C 45.47%, H 3.18%, N 4.42%, O 15.14%, S 10.12%, Ba 21.66%
Properties: Leaflets; slightly sol in water. Poisonous!
 
Use: Colorimetric determination of nitrates; oxidation-reduction indicator; detection of oxidizing substances.

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