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Names | |
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IUPAC name
Diphosphono hydrogenphosphate
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Systematic IUPAC name
Triphosphoric acid Tripolyphosphoric acid | |
Other names
Diphosphonophosphoric acid
Phosphono trihydrogenpyrophosphate Phosphonopyrophosphoric acid | |
Identifiers | |
3D model (
JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.030.752 |
EC Number |
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KEGG | |
PubChem
CID
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UNII | |
CompTox Dashboard (
EPA)
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Properties | |
H5P3O10 | |
Molar mass | 257.95 g/mol |
Acidity (pKa) | See body |
Conjugate base | Triphosphate |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
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Corrosive (C) |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
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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 20% 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]
Triphosporic acid is a pentaprotic acid, meaning that it can release five protons in basic enough conditions. Sources differ on the corresponding pKa values: