Used as a catalyst in various chemical reactions, especially in oxidation processes and organic synthesis. Commonly applied in the preparation of iron oxide materials for pigments, ceramics, and magnetic storage devices. Employed in wastewater treatment to remove contaminants through coagulation and precipitation. Also utilized in the production of catalysts for ammonia synthesis and in the formulation of corrosion inhibitors. In laboratory settings, serves as a source of iron ions in analytical chemistry and material science research.