Used as a pH indicator in analytical chemistry, particularly in acid-base titrations. It changes color from red in acidic conditions to yellow in basic conditions, making it useful for determining the endpoint in neutralization reactions. Commonly employed in educational laboratories for demonstrating pH-dependent color changes. Also utilized in the textile industry as an acid dye for protein fibers such as wool and in biochemical research to study azo compound interactions. Furthermore, employed in the preparation of other azo dyes and indicators due to its stable color response and water solubility.