Triphosphoric acid

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Triphosphoric acid
Triphosphorsäure.svg
Structure of triphosphoric acid
Names
IUPAC name
Diphosphono hydrogen phosphate
Identifiers
10380-08-2 YesY
  • InChI=1S/H5O10P3/c1-11(2,3)9-13(7,8)10-12(4,5)6/h(H,7,8)(H2,1,2,3)(H2,4, 5,6)
Properties
H5P3O10
Molar mass 257.95 g/mol
Acidity (pKa) small, small, 2.30, 6.50, 9.24
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY verify (what is YesYN ?)
Infobox references

Triphosphoric acid (also tripolyphosphoric acid), with formula H5P3O10, is a condensed form of phosphoric acid. In the family of phosphoric acids, it is the next polyphosphoric acid after pyrophosphoric acid, H4P2O7, also called diphosphoric acid.

Compounds such as ATP (adenosine triphosphate) are esters of triphosphoric acid.

Triphosphoric acid has not been obtained in crystalline form. The equilibrium mixture with an overall composition corresponding to H5P3O10 contains about 18% of triphosphoric acid. A solution of the pure species can be obtained by ion exchange of the sodium salt, sodium triphosphate, at 0 °C.[1]

Various pKa values are reported, 1.0 ; 2.2 ; 2.3 ; 5.7 ; 8.5,[1] 1.0 ; 2.2 ; 2.3 ; 3.7 ; 8.5 [2]

References

  1. 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found. – via ScienceDirect (Subscription may be required or content may be available in libraries.)
  2. Lua error in package.lua at line 80: module 'strict' not found.


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