Absolute Enthalpies of Hydration of Gaseous Ions

IonΔHh°(kJ/mol)
H+ -1091
Li+ -520
Na+ -406
K+ -320
Rb+ -296
Cs+ -264
In+ -344
Tl+ -328
Cu+ -593
Ag+ -473
Au+ -615
NH4+ -307
Be2+ -2484
Mg2+ -1926
Ca2+ -1579
IonΔHh°(kJ/mol)
Sr2+ -1446
Ba2+ -1309
Ti2+ 1862
Cr2+ -1908
Mn2+ -1851
Fe2+ -1950
Co2+ -2010
Ni2+ -2096
Cu2+ -2099
Pt2+ -2100
Zn2+ -2047
Cd2+ -1809
Hg2+ -1829
Sn2+ -1554
Pb2+ -1485
IonΔHh°(kJ/mol)
Al3+ -4680
Sc3+ -3930
Y3+ -4105
Ga3+ -4701
In3+ -4118
Tl3+ -4108
Cr3+ -4563
Fe3+ -4429
Co3+ -4653
F- -524
Cl- -378
Br- -348
I- -308
NO3- -314
OH- -460

Reference: Dasent, p. 152; D.W. Smith, J. Chem. Educ., 54, 540 (1977).