Used in redox titrations to determine the concentration of oxidizing agents, particularly in the analysis of hydrogen peroxide, potassium permanganate, and dichromate solutions. It serves as a stable reducing agent in volumetric analysis due to its consistent iron(II) content. Commonly applied in water and wastewater testing to measure chemical oxygen demand (COD). Also utilized in educational laboratories for teaching titration techniques because of its reliability and well-defined reaction stoichiometry.