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.

Sources differ on the corresponding pKa values: This inorganic compound–related article is a stub.