Used primarily as a reagent in organic synthesis, this compound plays a key role in the preparation of azo dyes, which are widely applied in the textile industry for coloring fabrics. It is also utilized in analytical chemistry for the detection and quantification of aldehydes and ketones, making it valuable in various chemical assays. Additionally, it serves as an intermediate in the production of pharmaceuticals, contributing to the synthesis of active pharmaceutical ingredients. Its sulfonic acid group enhances solubility in water, making it useful in formulations requiring aqueous compatibility.