Used in fertilizer production to provide phosphorus essential for plant growth. Commonly employed in food and beverage industry as an acidulant in soft drinks to provide tart flavor and pH control. Utilized in rust removal and metal surface treatment due to its ability to convert iron oxide into protective coating. Applied in dentistry and orthodontics for etching tooth enamel to improve adhesion of fillings and brackets. Also found in cleaning products for descaling and removing mineral deposits. Used in pharmaceuticals as an acidifier and in buffer solutions. Plays a role in semiconductor manufacturing for wet etching processes.