Used as a reagent in analytical chemistry for the detection and quantification of oxidizing agents, particularly in iodometric titrations. It helps liberate iodine from iodide when exposed to oxidants like hydrogen peroxide, ozone, or chlorine, enabling measurement through titration with thiosulfate. Commonly applied in water quality testing to determine residual oxidant levels. Also utilized in organic synthesis as a source of nucleophilic iodide ions in substitution reactions. In some cases, it serves as a stabilizer in photographic chemistry and in electrochemical applications.