Used in redox titrations to determine the concentration of oxidizing agents such as potassium permanganate, potassium dichromate, and hydrogen peroxide. It serves as a stable reducing agent in volumetric analysis due to its well-defined iron(II) content. Commonly applied in water and wastewater testing to measure chemical oxygen demand (COD). Also used in educational laboratories for teaching titration techniques because of its stability and ease of handling. Suitable for standardizing potassium permanganate solutions in acidic conditions where iron(II) is oxidized to iron(III).