Used in fertilizer production to provide phosphorus, an essential nutrient for plant growth. Also serves as an acidulant in food and beverages, particularly in soft drinks, to add tartness and adjust pH. Employed in rust removal and metal surface treatment by converting iron oxide into a protective phosphate coating. Utilized in dentistry and orthodontics to etch tooth surfaces for better adhesion of fillings and braces. Acts as a buffering agent in pharmaceuticals and in cleaning products for its ability to stabilize pH and enhance cleaning efficiency.