Used in fertilizers to provide phosphorus, a vital nutrient for plant growth. Plays a key role in the production of phosphate salts for agricultural use. In the food industry, serves as an acidulant in soft drinks, especially colas, to provide tartness and act as a preservative. Used in dentistry and orthodontics to etch tooth surfaces for better bonding of fillings or braces. Employed in rust removal and metal cleaning by converting iron oxide into a phosphate coating that can be easily removed. Also functions as a pH adjuster in various industrial and consumer products, including detergents and cosmetics. In laboratories, used as a buffer component in biochemical and analytical procedures.