Used in the synthesis of azo dyes and pigments due to its ability to form stable diazonium salts. Commonly employed in the textile industry for dyeing cotton, wool, and silk. Also serves as an intermediate in the production of pharmaceuticals and agrochemicals. Its sulfonic acid group enhances water solubility, making it suitable for applications requiring good dispersion in aqueous systems. Additionally, it finds use in the development of conductive polymers and functional materials in electrochemical applications.