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Sulfanilic acid

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.

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Further Information

Names

Preferred IUPAC name: 4-Aminobenzene-1-sulfonic acid

Other names

4-Aminobenzenesulfonic acid
-Aminobenzenesulfonic acid
Sulfanilic acid (not retained)

Identifiers

CAS Number: 121-57-3

JSmol: Interactive image

ChEBI: CHEBI:27500

ECHA InfoCard: 100.004.075

PubChem: 8479

Properties

Chemical formula: CHNOS673

Molar mass: 173.19

Density: 1.485

Melting point: 288 °C (550 °F; 561 K)

Solubility in water: 12.51 g/L

K: 3.25 at 298K

Related compounds

Related sulfonic acids: Benzenesulfonic acid

Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).

Infobox references