Diphosphate(aq)
Formation Gibbs Energy
Estimated ΔfG'm -1956.1 ± 2.2 [kJ/mol]    Enter custom concentration »
Estimated ΔfG'° -1939.0 ± 2.2 [kJ/mol]
Estimated using Component Contribution (2013)
pH
Ionic strength [M]
General Properties
Formula H4O7P2
Common names Diphosphate; Diphosphoric acid; PPi; Pyrophosphate; Pyrophosphate this is an approximate result.; Pyrophosphoric acid; C00013
Molar Mass 177.94 [Da]
Structure
Links KEGG »
Species Formation Energies
Phase Net charge #Hydrogens Δf [kJ/mol] ΔfG'° [kJ/mol] Reference
aqueous -4 0 -1927.0 -1936.8 Component Contribution (2013)
aqueous -3 1 -1972.4 -1937.4
aqueous -2 2 -2011.8 -1933.1
aqueous -1 3 -2029.2 -1908.2
aqueous 0 4 -2038.9 -1876.7
aqueous -4 0 -1919.9 -1929.7 Alberty (2003)
aqueous -3 1 -1973.9 -1938.8
aqueous -2 2 -2012.2 -1933.6
aqueous -1 3 -2025.1 -1904.1
aqueous 0 4 -2029.9 -1867.7