Used as a reagent in protein detection tests, particularly in urine analysis. It helps precipitate proteins, allowing for the measurement of protein levels in clinical diagnostics. Commonly used in the sulfosalicylic acid test to detect abnormal protein concentrations, aiding in the diagnosis of kidney disorders and other medical conditions. Also serves as an intermediate in the synthesis of dyes and pharmaceuticals. Its chelating properties make it useful in metal ion detection and removal in analytical chemistry.