Appendix K: Formation Constants for Complex Ions

Formation Constants for Complex Ions
Equilibrium Kf
\text{Al}^{3+}\;+\;6\text{F}^{-}\;{\rightleftharpoons}\;[\text{AlF}_6]^{3-} 7 × 1019
\text{Cd}^{2+}\;+\;4\text{NH}_3\;{\rightleftharpoons}\;[\text{Cd(NH}_3\text{)}_4]^{2+} 1.3 × 107
\text{Cd}^{2+}\;+\;4\text{CN}^{-}\;{\rightleftharpoons}\;[\text{Cd(CN)}_4]^{2-} 3 × 1018
\text{Co}^{2+}\;+\;6\text{NH}_3\;{\rightleftharpoons}\;[\text{Co(NH}_3\text{)}_6]^{2+} 1.3 × 105
\text{Co}^{3+}\;+\;6\text{NH}_3\;{\rightleftharpoons}\;[\text{Co(NH}_3\text{)}_6]^{3+} 2.3 × 1033
\text{Cu}^+\;+\;2\text{CN}\;{\rightleftharpoons}\;[\text{Cu(CN)}_2]^{-} 1.0 × 1016
\text{Cu}^{2+}\;+\;4\text{NH}_3\;{\rightleftharpoons}\;[\text{Cu(NH}_3\text{)}_4]^{2+} 1.7 × 1013
\text{Fe}^{2+}\;+\;6\text{CN}^{-}\;{\rightleftharpoons}\;[\text{Fe(CN)}_6]^{4-} 1.5 × 1035
\text{Fe}^{3+}\;+\;6\text{CN}^{-}\;{\rightleftharpoons}\;[\text{Fe(CN)}_6]^{3-} 2 × 1043
\text{Fe}^{3+}\;+\;6\text{SCN}^{-}\;{\rightleftharpoons}\;[\text{Fe(SCN)}_6]^{3-} 3.2 × 103
\text{Hg}^{2+}\;+\;4\text{Cl}^{-}\;{\rightleftharpoons}\;[\text{HgCl}_4]^{2-} 1.1 × 1016
\text{Ni}^{2+}\;+\;6\text{NH}_3\;{\rightleftharpoons}\;[\text{Ni(NH}_3\text{)}_6]^{2+} 2.0 × 108
\text{Ag}^{+}\;+\;2\text{Cl}^{-}\;{\rightleftharpoons}\;[\text{AgCl}_2]^{-} 1.8 × 105
\text{Ag}^{+}\;+\;2\text{CN}^{-}\;{\rightleftharpoons}\;[\text{Ag(CN)}_2]^{-} 1 × 1021
\text{Ag}^{+}\;+\;2\text{NH}_3\;{\rightleftharpoons}\;[\text{Ag(NH}_3\text{)}_2]^{+} 1.7 × 107
\text{Zn}^{2+}\;+\;4\text{CN}^{-}\;{\rightleftharpoons}\;[\text{Zn(CN)}_4]^{2-} 2.1 × 1019
\text{Zn}^{2+}\;+\;4\text{OH}^{-}\;{\rightleftharpoons}\;[\text{Zn(OH)}_4]^{2-} 2 × 1015
\text{Fe}^{3+}\;+\;\text{SCN}^{-}\;{\rightleftharpoons}\;[\text{Fe(SCN)}]^{2+} 8.9 × 102
\text{Ag}^+\;+\;4\text{SCN}^{-}\;{\rightleftharpoons}\;[\text{Ag(SCN)}_4]^{3-} 1.2 × 1010
\text{Pb}^{2+}\;+\;4\text{I}^{-}\;{\rightleftharpoons}\;[\text{PbI}_4]^{2-} 3.0 × 104
\text{Pt}^{2+}\;+\;4\text{Cl}^{-}\;{\rightleftharpoons}\;[\text{PtCl}_4]^{2-} 1 × 1016
\text{Cu}^{2+}\;+\;4\text{CN}\;{\rightleftharpoons}\;[\text{Cu(CN)}_4]^{2-} 1.0 × 1025
\text{Co}^{2+}\;+\;4\text{SCN}^{-}\;{\rightleftharpoons}\;[\text{Co(SCN)}_4]^{2-} 1 × 103

 

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Appendix K: Formation Constants for Complex Ions by Rice University is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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