Used in fertilizers to provide phosphorus, essential for plant growth. Key ingredient in rust removers and metal cleaners due to its ability to convert iron oxide into protective coating. Employed in food and beverages as an acidulant, especially in colas, to add tartness and act as a preservative. Used in dentistry and orthodontics to etch tooth surfaces for better adhesion of fillings and braces. Serves as a pH adjuster in cosmetics, detergents, and cleaning products. Applied in semiconductor manufacturing for etching and cleaning silicon wafers. Used in water treatment to control scale and corrosion in pipes and boilers.