Sulfanilic 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.
Molar mass: 173.2 g/mol
Solubility in water: 12.51 kg/m³
Related sulfonic acids: Benzenesulfonic acid; p-Toluenesulfonic acid