1.The dominant use of phosphoric acid is for fertilizers, consuming approximately 90% of production.
Food-grade phosphoric acid is used to acidify foods and beverages such as various colas and jams. It provides a tangy or sour taste. Various salts of phosphoric acid, such as monocalcium phosphate, are used as leavening agents.Phosphoric acid in soft drinks has the potential to cause dental erosion.
Rust removal，Phosphoric acid may be used to remove rust by direct application to rusted iron, steel tools, or other surfaces. The phosphoric acid changes the reddish-brown iron(III) oxide, Fe2O3 (rust), to ferric phosphate, FePO4.
Liquid phosphoric acid may be used for dipping, but phosphoric acid for rust "removal" is more often formulated as a gel. As a thick gel, it may be applied to sloping, vertical, or even overhead surfaces. Different phosphoric acid gel formulations are sold as "rust removers" or "rust killers". Multiple applications of phosphoric acid may be required to convert all rust. Rust may also be removed by phosphate conversion coating.
Phosphoric acid is used in dentistry and orthodontics as an etching solution, to clean and roughen the surfaces of teeth where dental appliances or fillings will be placed. Phosphoric acid is also an ingredient in over-the-counter anti-nausea medications that also contain high levels of sugar (glucose and fructose). This acid is also used in many teeth whiteners to eliminate plaque that may be on the teeth before application.
As a pH adjuster in cosmetics and skin-care products.
As a dispersing agent in detergents and leather treatment.
As an additive to stabilize acidic aqueous solutions within a wanted and specified pH range.
As a sanitizing agent in the dairy, food, and brewing industries.
As a main reactive agent in electrochemical weld cleaning.
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