Phosphoric acid or orthophosphoric acid, chemical formula H3PO4, molecular weight 97.994, is a common inorganic acid, is a strong acid. It can be obtained by dissolving P2O5 in hot water. Phosphoric acid is produced by treating apatite with sulfuric acid. Phosphoric acid deliquesces easily in the air. When heated, the water will be dehydrated to obtain pyrophosphoric acid, and then further dehydrated to obtain metaphosphoric acid. Phosphoric acid is mainly used in pharmaceutical, food, fertilizer and other industries, including home cleaning products as antirust agent, food additive, dental and orthopedic, EDIC corrosion agent, electrolyte, flux, dispersant, industrial corrosion agent, fertilizer raw materials and components. It can also be used as a chemical reagent. Phosphate is the nutrition of all life forms.
261 ℃ (decomposition)
It is mutually soluble with water in any ratio
White solid,Colorless viscous liquid when temperature is higher than 42 ℃
Mainly used in pharmaceutical, food, fertilizer and other industries, but also as a chemical reagent
Agriculture: phosphoric acid is the raw material for the production of important phosphate fertilizer (superphosphate, potassium dihydrogen phosphate, etc.), and also for the production of feed nutrients (calcium dihydrogen phosphate).
Industry: phosphoric acid is an important chemical raw material. Its main functions are as follows:
The surface of metal is treated to form insoluble phosphate film on the surface of metal to protect the metal from corrosion.
Mixed with nitric acid as chemical polishing agent to improve the surface finish of metal. Production of washing supplies, pesticide raw materials phosphate. Raw materials for the production of phosphorus containing flame retardants.
Food: phosphoric acid is one of the food additives. As an acid and yeast nutrient in food, cola contains phosphoric acid. Phosphate is also an important food additive, which can be used as a nutritional enhancer.
Medicine: phosphoric acid can be used to produce phosphorous drugs, such as sodium glycerophosphate, etc.