Knowra Pyrophosphoric acid Pyrophosphoric acid Pyrophosphoric acid, H₄P₂O₇, is a diphosphoric acid formed by condensation of two phosphoric acid molecules with loss of water. Its two phosphorus atoms are joined by a P–O–P bond.
Phosphoric acid : A triprotic inorganic acid with formula H₃PO₄, containing one phosphorus atom bonded to four oxygen atoms. Two phosphoric acid molecules condense, releasing water to form this acid.
Phosphate : An ion or functional group derived from phosphoric acid, containing phosphorus bonded to oxygen atoms. Pyrophosphoric acid consists of two linked phosphate units.
Sodium pyrophosphate : A sodium salt of diphosphoric acid, used in food processing, detergents, and chemical applications. It is a widely used salt derived from pyrophosphoric acid.
Polyphosphoric acid : A family of condensed phosphoric acids containing chains of phosphorus–oxygen units. Pyrophosphoric acid is the shortest member of the condensed phosphoric acid series.
Condensation reaction : A chemical reaction in which molecules join while a small molecule, often water, is eliminated. It describes the bond-forming process that produces the P–O–P bridge.
Phosphorus : A chemical element with symbol P and atomic number 15. Its oxidation state and bonding define the acid’s inorganic structure.
Pyrophosphate : The diphosphate ion, P₂O₇⁴⁻, or a salt containing that ion. This fully deprotonated form underlies many practical pyrophosphate salts.
Triphosphoric acid : A condensed phosphoric acid with three phosphorus atoms linked by two P–O–P bridges. It extends the same condensation pattern by one phosphorus unit.
Diphosphate : An ion or salt containing two phosphorus atoms connected through an oxygen bridge. Deprotonation of pyrophosphoric acid yields diphosphate species.
Oxoacid : An acid containing oxygen, hydrogen, and another element, with acidic hydrogen typically bonded to oxygen. Pyrophosphoric acid belongs to the oxygen-containing acids of phosphorus.
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