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CAS No.121-57-3
Chemical Name:Sulfanilic acid
SynonymsNSC 7170;sulfanilic;p-Sulfoaniline;4-SULFOANILINE;SUFANILIC ACID;Sulfanilsaeure;SULFANILIC ACID;SulfonamineAcid;SULFANILLIC ACID;SULPHANILIC ACID
CBNumber:CB1489237
Molecular Formula:C6H7NO3S
Melting point:>300 °C(lit.)
Density:1.485
storage temp.: Store in dark
solubility:10g/l
pka3.24(at 25℃)
PH2.5 (10g/l, H2O, 20℃)
Water Solubility: 0.1 g/100 mL (20 ºC)
Merck: 14,8926
BRN: 908765

Sulfanilic acid (4-aminobenzenesulfonic acid ) is an off-white crystalline solid which finds application in quantitative analysis of nitrate and nitrite ions. The solid acid exists as a zwitterion, and has an unusually high melting point.
Sulfanilic acid can be produced by sulfonation of aniline