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# 22.3: Formation Constants for Complex Ions

Formation Constants for Complex Ions
Equilibrium Kf
$$\ce{Al^3+ + 6F- ⇌ [AlF6]^3-}$$ 7 × 1019
$$\ce{Cd^2+ + 4NH3 ⇌ [Cd(NH3)4]^2+}$$ 1.3 × 107
$$\ce{Cd^2+ + 4CN- ⇌ [Cd(CN)4]^2-}$$ 3 × 1018
$$\ce{Co^2+ + 6NH3 ⇌ [Co(NH3)6]^2+}$$ 1.3 × 105
$$\ce{Co^3+ + 6NH3 ⇌ [Co(NH3)6]^3+}$$ 2.3 × 1033
$$\ce{Cu+ + 2CN ⇌ [Cu(CN)2]-}$$ 1.0 × 1016
$$\ce{Cu^2+ + 4NH3⇌[Cu(NH3)4]^2+}$$ 1.7 × 1013
$$\ce{Fe^2+ + 6CN- ⇌[Fe(CN)6]^4-}$$ 1.5 × 1035
$$\ce{Fe^3+ + 6CN- ⇌[Fe(CN)6]^3-}$$ 2 × 1043
$$\ce{Fe^3+ + 6SCN- ⇌[Fe(SCN)6]^3-}$$ 3.2 × 103
$$\ce{Hg^2+ + 4Cl- ⇌[HgCl4]^2-}$$ 1.1 × 1016
$$\ce{Ni^2+ + 6NH3⇌[Ni(NH3)6]^2+}$$ 2.0 × 108
$$\ce{Ag+ + 2Cl- ⇌[AgCl2]-}$$ 1.8 × 105
$$\ce{Ag+ + 2CN- ⇌[Ag(CN)2]-}$$ 1 × 1021
$$\ce{Ag+ + 2NH3⇌[Ag(NH3)2]+}$$ 1.7 × 107
$$\ce{Zn^2+ + 4CN- ⇌[Zn(CN)4]^2-}$$ 2.1 × 1019
$$\ce{Zn^2+ + 4OH- ⇌[Zn(OH)4]^2-}$$ 2 × 1015
$$\ce{Fe^3+ + SCN- ⇌[Fe(SCN)]^2+}$$ 8.9 × 102
$$\ce{Ag+ + 4SCN- ⇌[Ag(SCN)4]^3-}$$ 1.2 × 1010
$$\ce{Pb^2+ + 4I- ⇌[PbI4]^2-}$$ 3.0 × 104
$$\ce{Pt^2+ + 4Cl- ⇌[PtCl4]^2-}$$ 1 × 1016
$$\ce{Cu^2+ + 4CN⇌[Cu(CN)4]^2-}$$ 1.0 × 1025
$$\ce{Co^2+ + 4SCN- ⇌[Co(SCN)4]^2-}$$ × 103