Phosphoric acid (orthophosphoric acid, monophosphoric acid or phosphoric(V) acid) is a colorless, odorless phosphorus-containing solid, and inorganic compound with the chemical formula H3PO4. It is commonly encountered as an 85% aqueous solution, which is a colourless, odourless, and non-volatile syrupy liquid. It is a major industrial chemical, being a component of many fertilizers.
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas and jams, providing a tangy or sour taste. The phosphoric acid also serves as a preservative. Soft drinks containing phosphoric acid, which would include Coca-Cola, are sometimes called phosphate sodas or phosphates. Phosphoric acid in soft drinks has the potential to cause dental erosion. Phosphoric acid also has the potential to contribute to the formation of kidney stones, especially in those who have had kidney stones previously.
Transparent colorless viscous solution, odorless. General content of 85% ~ 95%. Continue to concentrate to obtain colorless columnar crystals, density (18 deg C) 1.834g/cm3, melting point 42.3 deg C, boiling point 158 deg C, freezing point 21.1 deg C. It was heated to 150 ° C. And changed to pyrophosphoric acid and to metaphosphoric acid at about 215 ° C., with a vapor pressure of 300. Strong deliquescence. Miscible with water and ethanol.

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