Sulpanilic Acid identified by 173.186 g/mol molecular weight and C6H7NO3S or NH2C6H4SO3H molecular formula appears as a white powder with faint purple tinge, or off-white crystalline solid. When around 212°F atmosphere, it becomes anhydrous. It is useful in making dyes and sulpha drugs as the compound readily forms diazo compounds. People often use Sufanilic Acid in the quantitative analysis of nitrate and its ions by diazonium coupling reaction with N-(1-Naphthyl)ethylenediamine. This results in an azo dye, wherein nitrate/ nitrate ions concentration is eliminated from the color intensity of the red solution by colorimetry. Customers can buy from us this chemical in pure, technical, dry powder and solution grades, and use it as a concrete additive, an intermediate for producing yellow food dye, in several pharmaceutical applications, and optical brighteners for white paper.