Used in analytical chemistry for redox titrations, particularly in the determination of oxidizing agents such as potassium permanganate, potassium dichromate, and hydrogen peroxide. It serves as a stable reducing agent due to the presence of ferrous iron (Fe²⁺), which donates electrons in a predictable and measurable way. The solution is standardized for precise concentration, making it ideal for volumetric analysis in environmental testing, water quality analysis, and industrial quality control. Commonly employed in educational laboratories to teach titration techniques because of its stability and clear reaction endpoints.