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Appendix K  Formation Constants for Complex Ions 

 

Table K1  Formation Constants for Complex Ions

Equilibrium

Kf
  Al3+ + 6 F− ⇌ [AlF6]3−

7 × 1019
  Cd2+ + 4 NH3 ⇌ Cd(NH3)42+

1.3 × 107
  Cd2+ + 4 CN− ⇌ Cd(CN)42−

3 × 1018
  Co2+ + 4 SCN− ⇌ Co(SCN)42−

1 × 103
  Co2+ + 6 NH3 ⇌ Co(NH3)62+

1.3 × 105
  Co3+ + 6 NH3 ⇌ Co(NH3)63+

2.3 × 1033
  Cu+ + 2 CN− ⇌ Cu(CN)2−

1.0 × 1016
  Cu2+ + 4 NH3 ⇌ Cu(NH3)42+

1.7 × 1013
  Cu2+ + 4 CN− ⇌ Cu(CN)42−

1.0 × 1025
  Fe2+ + 6 CN− ⇌ Fe(CN)64−

1.5 × 1035
  Fe3+ + 6 CN− ⇌ Fe(CN)63−

2 × 1043
  Fe3+ + SCN− ⇌ FeSCN2+

8.9 × 102
  Fe3+ + 6 SCN− ⇌ Fe(SCN)63−

3.2 × 103
  Hg2+ + 4 Cl− ⇌ HgCl42−

1.1 × 1016
  Ni2+ + 6 NH3 ⇌ Ni(NH3)62+

2.0 × 108
  Ag+ + 2 Cl− ⇌ AgCl2−

1.8 × 105
  Ag+ + 2 CN− ⇌ Ag(CN)2−

1 × 1021
  Ag+ + 2 NH3 ⇌ Ag(NH3)2+

1.7 × 107
  Ag+ + 4 SCN− ⇌ Ag(SCN)43−

1.2 × 1010
  Zn2+ + 4 CN− ⇌ Zn(CN)42−

2.1 × 1019
  Zn2+ + 4 OH− ⇌ Zn(OH)42−

2 × 1015
  Pb2+ + 4 I− ⇌ PbI42−

3.0 × 104
  Pt2+ + 4 Cl− ⇌ PtCl42−

1 × 1016

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Appendix K Formation Constants for Complex Ions Copyright © by Nicole Bouvier-Brown; Saori Shiraki; J. Ryan Hunt; and Emily Jarvis is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.

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