Used as a pH indicator in analytical chemistry, particularly in titrations involving weak acids and bases. It exhibits a distinct color change around pH 7.8 to 9.8, shifting from yellow to red or violet, making it suitable for detecting endpoint in alkaline range titrations. Also employed in the preparation of specialized dyes and as an intermediate in the synthesis of azo dye compounds for textile and research applications. Its azo structure contributes to chromogenic properties useful in spectrophotometric analysis.