Used as a cleaning agent for removing rust and ink stains due to its ability to form soluble complexes with iron. Commonly applied in household and industrial settings for metal surface treatment, especially in cleaning and restoring rusted tools or machinery. Employed in beekeeping as a miticide to control Varroa mites in honeybee colonies. Utilized in the textile industry for bleaching and finishing processes. Also used in rare earth element processing and as a reagent in analytical chemistry for standardizing potassium permanganate solutions.