General information: Phosphoric acid is an inorganic mineral acid having the chemical formula H3PO4. Alternatively, orthophosphoric acid molecules can combine with themselves to form a variety of compounds referred to as phosphoric acids in a more general way. The term "phosphoric acid" can also refer to a chemical or reagent consisting of phosphoric acids, usually mostly orthophosphoric acid. Phosphoric acid is prepared by adding sulphuric acid to calcium phosphate rock. In its anhydrous form the acid is a white solid. While phosphoric acid has the potential to release three hydrogen ions, in aqueous solution only two are available due to the fact that PO4-3 is a stronger base than hydroxide.
Chemical formula: H3PO4 Rel. mol. weight: 98.0
CAS No.: 7664-38-2
EINECS No.: 231-633-2
UN No.: 1805
Density (20°C): 1.71 g/cm³
Solubility in water (20 °C): soluble
Melting point: 21 °C
Boiling point: 158 °C