Phosphates are the salt of phosphoric acids. The most common and important in practical terms are salts of orthophosphoric acid (N -3RO4). Orthophosphoric acid, depending on the number of hydrogen atoms substituted in its molecules to atoms of metal forms a three rows of phosphates: medium, or Transnistria, phosphates (e.g.3RO4), sour, or (disubstituted), phosphates (e.g.2NRA4), and one-deputizing f, (for example, KN2RO4). In water soluble only an alkaline phosphates metals. The phosphates also include complex esters of phosphoric acid. Some, such as the ATP are batteries and power sources in biochemical processes. Phosphates take an active part in the processes of life. So, phosphate calcium Sa3(RO4)2 is a mineral base of bone tissue. Phosphates sodium and potassium together with the form bicarbonate buffer system of blood and other biological liquids; inorganic phosphates are suppliers of phosphorus for a number of organic compounds (see Phosphatides, Phosphoprotein), etc.
Some of the phosphates are used as medicinal substances, for example disubstituted sodium phosphate - laxative, glycyrrhizinate calcium tonic preparation. Cm. also Mineral metabolism.