Used in fertilizers to provide phosphorus, a vital nutrient for plant growth. Commonly found in rust removers and metal cleaners due to its ability to convert iron oxide into a protective coating. An ingredient in some food and beverages, especially colas, to add tartness and act as a preservative. Used in dental and orthodontic treatments to etch tooth surfaces before applying sealants or braces. Employed in the production of detergents and cleaning agents for industrial and household use. Serves as a pH adjuster in various chemical and biological processes. Used in the semiconductor industry during wet etching processes.