Phosphorus tetroxide

Diphosphorus tetroxide, or phosphorus tetroxide is an inorganic compound of phosphorus and oxygen. It has the empirical chemical formula P
2O
4. Solid phosphorus tetroxide (also referred to as phosphorus(III,V)-oxide) consists of variable mixtures of the mixed-valence oxides P4O7, P4O8 and P4O9.[1][2][3]

Phosphorus tetroxide
Names
Other names
Phosphorus tetroxide
Phosphorus(V) oxide
Phosphoric anhydride
Identifiers
Properties
P2O4
Molar mass 125.96 g·mol−1
Appearance Solid
Melting point >100 °C
Vapor pressure 2.54 g·cm−3
Hazards
not listed
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Preparation

Phosphorus tetroxide is obtainable by thermal decomposition of phosphorus trioxide, which disproportionates above 210 °C to form phosphorus tetroxide, with elemental phosphorus as a byproduct:

In addition, phosphorus trioxide can be converted into phosphorus tetroxide by controlled oxidation with oxygen in carbon tetrachloride solution.[4][5][6]

Careful reduction of phosphorus pentoxide with red phosphorus at 450-525 °C also produces the phosphorus tetroxide.

References
  1. http://www.wiley.com/college/math/chem/cg/sales/voet.html.
  2. Alberts B.; et al. (2002). Molecular Biology of the Cell, 4th Ed. Garland Science. ISBN 978-0-8153-4072-0.
  3. Voet D., Voet J. G. (2004-03-09). Biochemistry, 3rd Ed. Wiley. ISBN 978-0-471-19350-0.
  4. Atkins P., de Paula J. (2006). Physical chemistry, 8th Ed. San Francisco: W. H. Freeman. ISBN 978-0-7167-8759-4.
  5. Petrucci, Ralph H.; Harwood, William S.; Herring, F. Geoffrey (2002). General chemistry: principles and modern applications (8th ed.). Upper Saddle River, N.J: Prentice Hall. ISBN 978-0-13-014329-7. LCCN 2001032331. OCLC 46872308.CS1 maint: ref=harv (link)
  6. Laidler K. J. (1978). Physical chemistry with biological applications. Benjamin/Cummings. Menlo Park. ISBN 978-0-8053-5680-9.
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