Used in redox titrations to determine the concentration of oxidizing agents, especially in the analysis of hydrogen peroxide, potassium permanganate, and dichromate solutions. It serves as a stable reducing agent in volumetric analysis due to its well-defined iron(II) content. Commonly applied in environmental testing, water quality analysis, and industrial quality control where precise measurement of oxidation-reduction reactions is required. Its role as a primary standard ensures high accuracy and reproducibility in titration results.