Used in analytical chemistry for calibration of instruments such as ion-selective electrodes and spectrophotometers to accurately measure iodide concentrations in samples. Commonly applied in environmental testing to determine iodide levels in water and soil. Employed in pharmaceutical quality control to ensure proper iodine content in medications and disinfectants. Supports research in thyroid function studies due to iodide's role in hormone production. Also utilized in educational labs for titration experiments and teaching quantitative analysis techniques.