Used in fertilizers to provide phosphorus, an essential nutrient for plant growth. Key ingredient in rust removers and metal cleaners due to its ability to convert iron oxide into a protective phosphate coating. Found in some dental etching gels to prepare tooth surfaces for bonding procedures. Acts as an acidulant in soft drinks, especially colas, to provide tartness and preserve freshness. Used in food processing to adjust pH and as a leavening agent in baked goods. Employed in the production of phosphate salts for detergents and cleaning agents. Serves as a buffering agent in laboratory and industrial processes requiring stable pH control.