My watch list  

Sulfanilic acid

Sulfanilic acid
IUPAC name p-aminobenzenesulphonic acid
Other names Sulphanilic acid
CAS number 121-57-3
PubChem 8479
InChI InChI=InChI=1/C6H7NO3S/c7-5-
Molecular formula C6H7NO3S
Molar mass 173.19
Melting point

288 °C, 561 K, 550 °F

Solubility in water >20 g/l
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Sulphanilic acid (4-aminobenzene sulfonic acid ) is a colourless crystalline solid produced from sulfonation of aniline.[1]

It readily forms diazo compounds and is used to make dyes and sulpha drugs. [1]

It is a zwitter ion with an unusual high melting point.


  1. ^ a b "Sulphanilic acid". A Dictionary of Chemistry. Oxford University Press, 2000. Oxford Reference Online. Oxford University Press.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sulfanilic_acid". A list of authors is available in Wikipedia.
Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE