Phosphoric acid or orthophosphate, chemical formula H3PO4, molecular weight 97.9724, is a common inorganic acid, is a medium strong acid. It is obtained by dissolving phosphorus decaoxide in hot water. Phosphoric acid is obtained industrially by treating apatite with sulfuric acid. Phosphoric acid delixes easily in air. Heat will lose water to pyrophosphoric acid, and further water loss to metaphosphate. Phosphoric acid is mainly used in pharmaceutical, food, fertilizer and other industries, and can also be used as a chemical reagent.
Agriculture: Phosphoric acid is a raw material for the production of important phosphate fertilizers (superphosphate, potassium dihydrogen phosphate, etc.), and is also a raw material for the production of feed nutrients (calcium dihydrogen phosphate).
Industry: Phosphoric acid is an important chemical raw material. Its main functions are as follows:
Treat the metal surface to create an insoluble phosphate film on the metal surface to protect the metal from corrosion.
It is mixed with nitric acid as a chemical polish to improve the finish of metal surfaces.
The production of detergent, pesticide raw material phosphate ester.
Raw materials for the production of phosphorus-containing flame retardants.
Food: Phosphoric acid is one of the food additives, in food as a sour agent, yeast nutrition agent, Coca-Cola contains phosphoric acid. Phosphate is also an important food additive and can be used as a nutrient enhancer.
Medicine: Phosphoric acid can be used to make phosphorus-containing drugs, such as sodium glycerophosphate.
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