Formation Constants for Complex Ions

Equilibrium Kf
Al3++6F[AlF6]3-{\text{Al}}^{\text{3+}}\text{+}6{\text{F}}^{-}\rightleftharpoons{\left[{\text{AlF}}_{6}\right]}^{\text{3-}}
7×10197\times{10}^{19}
Cd2++4NH3[Cd(NH3)4]2+{\text{Cd}}^{\text{2+}}\text{+}4{\text{NH}}_{3}\rightleftharpoons{\left[\text{Cd}{\left({\text{NH}}_{3}\right)}_{4}\right]}^{\text{2}\text{+}}
1.3×1071.3\times{10}^{7}
Cd2++4CN[Cd(CN)4]2{\text{Cd}}^{\text{2+}}+4{\text{CN}}^{-}\rightleftharpoons{\left[\text{Cd}{\left(\text{CN}\right)}_{4}\right]}^{2-}
3×10183\times{10}^{18}
Co2++6NH3[Co(NH3)6]2+{\text{Co}}^{\text{2+}}+6{\text{NH}}_{3}\rightleftharpoons{\left[\text{Co}{\left({\text{NH}}_{3}\right)}_{6}\right]}^{2+}
1.3×1051.3\times{10}^{5}
Co3++6NH3[Co(NH3)6]3+{\text{Co}}^{\text{3+}}+6{\text{NH}}_{3}\rightleftharpoons{\left[\text{Co}{\left({\text{NH}}_{3}\right)}_{6}\right]}^{\text{3+}}
2.3×10332.3\times{10}^{33}
Cu++2CN[Cu(CN)2]{\text{Cu}}^{+}+2\text{CN}\rightleftharpoons{\left[\text{Cu}{\left(\text{CN}\right)}_{2}\right]}^{-}
1.0×10161.0\times{10}^{16}
Cu2++4NH3[Cu(NH3)4]2+{\text{Cu}}^{\text{2+}}+4{\text{NH}}_{3}\rightleftharpoons{\left[\text{Cu}{\left({\text{NH}}_{3}\right)}_{4}\right]}^{\text{2+}}
1.7×10131.7\times{10}^{13}
Fe2++6CN[Fe(CN)6]4{\text{Fe}}^{\text{2+}}+6{\text{CN}}^{-}\rightleftharpoons{\left[\text{Fe}{\left(\text{CN}\right)}_{6}\right]}^{4-}
1.5×10351.5\times{10}^{35}
Fe3++6CN[Fe(CN)6]3{\text{Fe}}^{\text{3+}}+6{\text{CN}}^{-}\rightleftharpoons{\left[\text{Fe}{\left(\text{CN}\right)}_{6}\right]}^{3-}
2×10432\times{10}^{43}
Fe3++6SCN[Fe(SCN)6]3{\text{Fe}}^{\text{3+}}+6{\text{SCN}}^{-}\rightleftharpoons{\left[\text{Fe}{\left(\text{SCN}\right)}_{6}\right]}^{3-}
3.2×1033.2\times{10}^{3}
Hg2++4Cl[HgCl4]2{\text{Hg}}^{\text{2+}}+4{\text{Cl}}^{-}\rightleftharpoons{\left[{\text{HgCl}}_{4}\right]}^{2-}
1.1×10161.1\times{10}^{16}
Ni2++6NH3[Ni(NH3)6]2+{\text{Ni}}^{\text{2+}}+6{\text{NH}}_{3}\rightleftharpoons{\left[\text{Ni}{\left({\text{NH}}_{3}\right)}_{6}\right]}^{\text{2+}}
2.0×1082.0\times{10}^{8}
Ag++2Cl[AgCl2]{\text{Ag}}^{+}+2{\text{Cl}}^{-}\rightleftharpoons{\left[{\text{AgCl}}_{2}\right]}^{-}
1.8×1051.8\times{10}^{5}
Ag++2CN[Ag(CN)2]{\text{Ag}}^{+}+2{\text{CN}}^{-}\rightleftharpoons{\left[\text{Ag}{\left(\text{CN}\right)}_{2}\right]}^{-}
1×10211\times{10}^{21}
Ag++2NH3[Ag(NH3)2]+{\text{Ag}}^{+}+2{\text{NH}}_{3}\rightleftharpoons{\left[\text{Ag}{\left({\text{NH}}_{3}\right)}_{2}\right]}^{+}
1.7×1071.7\times{10}^{7}
Zn2++4CN[Zn(CN)4]2{\text{Zn}}^{\text{2+}}+4{\text{CN}}^{-}\rightleftharpoons{\left[\text{Zn}{\left(\text{CN}\right)}_{4}\right]}^{2-}
2.1×10192.1\times{10}^{19}
Zn2++4OH[Zn(OH)4]2{\text{Zn}}^{\text{2+}}+4{\text{OH}}^{-}\rightleftharpoons{\left[\text{Zn}{\left(\text{OH}\right)}_{4}\right]}^{2-}
2×10152\times{10}^{15}
Fe3++SCN[Fe(SCN)]2+{\text{Fe}}^{\text{3+}}+{\text{SCN}}^{-}\rightleftharpoons{\left[\text{Fe}\left(\text{SCN}\right)\right]}^{\text{2+}}
8.9×1028.9\times{10}^{2}
Ag++4SCN[Ag(SCN)4]3{\text{Ag}}^{+}+4{\text{SCN}}^{-}\rightleftharpoons{\left[\text{Ag}{\left(\text{SCN}\right)}_{4}\right]}^{3-}
1.2×10101.2\times{10}^{10}
Pb2++4I[PbI4]2{\text{Pb}}^{\text{2+}}+4{\text{I}}^{-}\rightleftharpoons{\left[{\text{PbI}}_{4}\right]}^{2-}
3.0×1043.0\times{10}^{4}
Pt2++4Cl[PtCl4]2{\text{Pt}}^{\text{2+}}+4{\text{Cl}}^{-}\rightleftharpoons{\left[{\text{PtCl}}_{4}\right]}^{2-}
1×10161\times{10}^{16}
Cu2++4CN[Cu(CN)4]2{\text{Cu}}^{\text{2+}}+4\text{CN}\rightleftharpoons{\left[\text{Cu}{\left(\text{CN}\right)}_{4}\right]}^{2-}
1.0×10251.0\times{10}^{25}
Co2++4SCN[Co(SCN)4]2{\text{Co}}^{\text{2+}}+4{\text{SCN}}^{-}\rightleftharpoons{\left[\text{Co}{\left(\text{SCN}\right)}_{4}\right]}^{2-}
1×1031\times{10}^{3}

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