in the liquid phase favors the disproportionation of pyrophosphoric acid. Pyrophosphoric acid may be obtained from mixed phosphoric acids by careful crystallization or by the addition of seed crystals.

Reactions

Pyrophosphoric acid is a tetraprotic acid, with four distinct pKa's:
:, pKa = 0.85
:, pKa = 1.96
:, pKa = 6.60
:, pKa = 9.41 The pKa's occur in two distinct ranges because deprotonations occur on separate phosphate groups. For comparison with the pKa's for phosphoric acid

1.Previous
3.Next