Triphosphoric acid

Triphosphoric acid

Names
IUPAC name Diphosphono hydrogenphosphate
Systematic IUPAC name Triphosphoric acid Tripolyphosphoric acid
Other names Diphosphonophosphoric acid Phosphono trihydrogenpyrophosphate Phosphonopyrophosphoric acid
Identifiers
CAS Number	10380-08-2Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:39949N
ChemSpider	958N
ECHA InfoCard	100.030.752
EC Number	233-840-3
KEGG	C00404N
PubChemCID	983
UNII	NU43IAG5BCY
CompTox Dashboard(EPA)	DTXSID7047483
InChI 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)N Key: UNXRWKVEANCORM-UHFFFAOYSA-NN
SMILES OP(=O)(O)OP(=O)(O)OP(=O)(O)O
Properties
Chemical formula	H5P3O10
Molar mass	257.95 g/mol
Acidity(pKa)	See body
Conjugate base	Triphosphate
Hazards
Occupational safety and health(OHS/OSH):
Main hazards	Corrosive (C)
Except where otherwise noted, data are given for materials in theirstandard state(at 25 °C [77 °F], 100 kPa). Nverify(what isYN?) Infobox references

Triphosphoric acid(alsotripolyphosphoric acid), with formula H₅P₃O₁₀,is acondensedform ofphosphoric acid.In the family ofphosphoric acids,it is the nextpolyphosphoric acidafterpyrophosphoric acid,H₄P₂O₇,also called diphosphoric acid.

Compounds such as ATP (adenosine triphosphate) areestersof triphosphoric acid.

Triphosphoric acid has not been obtained in crystalline form. The equilibrium mixture with an overall composition corresponding to H₅P₃O₁₀contains 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.

Triphosporic acid is apentaprotic acid,meaning that it can release five protons in basic enough conditions. Sources differ on the corresponding pK_avalues:

• 1.0; 2.2; 2.3; 5.7; 8.5
• 1.0; 2.2; 2.3; 3.7; 8.5
• small; small; 2.30; 6.50; 9.24