12.3: Formation Constants for Complex Ions

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Formation Constants for Complex Ions
Equilibrium	K_f
\(\ce{Al^3+ + 6F- ⇌ [AlF6]^3-}\)	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
\(\ce{Co^2+ + 4SCN- ⇌[Co(SCN)4]^2-}\)	1 × 10³