CAS 121-57-3 Sulfanilic acid/steroidmisty@ycphar.com

Product Name:Sulfanilic acid
Alias:4-Aminobenzenesulfonic acid,4-Anilinesulfonic acid
CAS NO.:121-57-3 
EINECS:204-482-5
Molecular Formula:C6H7NO3S
Molecular Weight:173.19
Purity:99%
Grade:Industrial Grade
Appearance:White Powder

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.

As the compound readily form diazo compounds, it is used to make dyes and sulpha drugs. This property is also used for the quantitative analysis of nitrate and nitrite ions by diazonium coupling reaction with N-(1-Naphthyl)ethylenediamine, resulting in an azo dye, and the concentration of nitrate or nitrite ions were deduced from the color intensity of the resulting red solution by colorimetry.

It is also used as a standard in combustion analysis and in the Pauly reaction.