Phosphorus acid

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Phosphorus oxoacids are oxoacids of phosphorus. Phosphorus exhibits oxidation states from +1 to +5. Oxygen may be in oxidation state -2 or -1, depending on whether a compound contains the peroxide group.

There are a large number of such compounds, some of which cannot be isolated and are only known through their salts.

Examples of phosphorus acids include:[1]

Phosphorus oxoacids containing P in oxidation state +1:

Phosphorus oxoacids containing P in oxidation state +3:

Phosphorus oxoacids containing P in oxidation state +5 (see also phosphoric acids and phosphates):

  • H3PO4 (or PO(OH)3), Phosphoric acid, a tribasic acid
    • A similar compound is peroxomonophosphoric acid H3PO5 (or OP(OH)2(OOH)), a tribasic acid containing a peroxide group that replaces an oxygen atom in the hydroxyl group
  • H4P2O7 (or (OH)2(O)P-O-P(O)(OH)2), Pyrophosphoric acid, a tetraprotic acid
  • H5P3O10 (or (OH)2(O)P-O-P(O)(OH)-O-P(O)(OH)2), Triphosphoric acid, a pentaprotic acid
  • H3P3O9 (or (HPO3)3, (P(O)(OH)-O-)3), Trimetaphosphoric acid, a triprotic acid

Phosphorus oxoacids containing P in oxidation state +4:

Phosphorus oxoacids containing P in mixed oxidation states:

  • H4P2O6 (or H(OH)(O)P-O-P(O)(OH)2), Isohypophosphoric acid, a tetraprotic acid and isomer of hypophosphoric acid, containing P in oxidation state +3 and +5

External links[edit]

References[edit]

  1. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.