Used as a primary standard in redox titrations, particularly in the standardization of potassium permanganate and potassium dichromate solutions. Its high purity and stability make it ideal for accurate quantitative analysis in analytical chemistry. Also employed in educational laboratories to demonstrate titration techniques and study oxidation-reduction reactions. Additionally, it serves as a source of ferrous ions in the preparation of other iron compounds and in some electroplating processes. Furthermore, it is used in the textile industry as a reducing agent for dyes and in wastewater treatment processes requiring iron(II) ions for precipitation or reduction of pollutants.