Potassium tetraoxalate dihydrate is widely used in analytical chemistry as a primary standard for standardizing solutions in titrations, particularly for potassium permanganate (KMnO₄), due to its high purity and stability. It serves as a buffering agent in various biochemical and chemical processes, ensuring consistent pH levels. In the textile industry, it is employed as a mordant to fix dyes onto fabrics, enhancing color fastness. Additionally, it is utilized in metal cleaning and polishing, particularly for removing rust and tarnish from surfaces. Its chelating properties make it effective in water treatment processes to control metal ion concentrations.