Chemistry » Equilibria of Other Reaction Classes » Formation Constants for Complex Ions

# Appendix: Formation Constants For Complex Ions

### Formation Constants for Complex Ions

EquilibriumKf
$${\text{Al}}^{\text{3+}}+6{\text{F}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[{\text{AlF}}_{6}]}^{\text{3−}}$$7 $$×$$ 1019
$${\text{Cd}}^{\text{2+}}+4{\text{NH}}_{\text{3}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Cd}{({\text{NH}}_{3})}_{4}]}^{\text{2}\text{+}}$$1.3 $$×$$ 107
$${\text{Cd}}^{\text{2+}}+4{\text{CN}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Cd}{(\text{CN})}_{4}]}^{2-}$$3 $$×$$ 1018
$${\text{Co}}^{\text{2+}}+6{\text{NH}}_{\text{3}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Co}{({\text{NH}}_{3})}_{6}]}^{2+}$$1.3 $$×$$ 105
$${\text{Co}}^{\text{3+}}+6{\text{NH}}_{\text{3}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Co}{({\text{NH}}_{3})}_{6}]}^{3+}$$2.3 $$×$$ 1033
$${\text{Cu}}^{+}+2\text{CN}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Cu}{(\text{CN})}_{2}]}^{-}$$1.0 $$×$$ 1016
$${\text{Cu}}^{\text{2+}}+4{\text{NH}}_{\text{3}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Cu}{({\text{NH}}_{3})}_{4}]}^{2+}$$1.7 $$×$$ 1013
$${\text{Fe}}^{\text{2+}}+6{\text{CN}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Fe}{(\text{CN})}_{6}]}^{4-}$$1.5 $$×$$ 1035
$${\text{Fe}}^{\text{3+}}+6{\text{CN}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Fe}{(\text{CN})}_{6}]}^{3-}$$2 $$×$$ 1043
$${\text{Fe}}^{\text{3+}}+6{\text{SCN}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Fe}{(\text{SCN})}_{6}]}^{3-}$$3.2 $$×$$ 103
$${\text{Hg}}^{\text{2+}}+4{\text{Cl}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[{\text{HgCl}}_{4}]}^{2-}$$1.1 $$×$$ 1016
$${\text{Ni}}^{\text{2+}}+6{\text{NH}}_{\text{3}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Ni}{({\text{NH}}_{3})}_{6}]}^{2+}$$2.0 $$×$$ 108
$${\text{Ag}}^{\text{+}}+2{\text{Cl}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[{\text{AgCl}}_{2}]}^{-}$$1.8 $$×$$ 105
$${\text{Ag}}^{\text{+}}+2{\text{CN}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Ag}{(\text{CN})}_{2}]}^{-}$$1 $$×$$ 1021
$${\text{Ag}}^{\text{+}}+2{\text{NH}}_{\text{3}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Ag}{({\text{NH}}_{3})}_{2}]}^{+}$$1.7 $$×$$ 107
$${\text{Zn}}^{\text{2+}}+4{\text{CN}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Zn}{(\text{CN})}_{4}]}^{2-}$$2.1 $$×$$ 1019
$${\text{Zn}}^{\text{2+}}+4{\text{OH}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Zn}{(\text{OH})}_{4}]}^{2-}$$2 $$×$$ 1015
$${\text{Fe}}^{\text{3+}}+{\text{SCN}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Fe}(\text{SCN})]}^{2+}$$8.9 $$×$$ 102
$${\text{Ag}}^{\text{+}}+4{\text{SCN}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Ag}{(\text{SCN})}_{4}]}^{3-}$$1.2 $$×$$ 1010
$${\text{Pb}}^{\text{2+}}+4{\text{I}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[{\text{PbI}}_{4}]}^{2-}$$3.0 $$×$$ 104
$${\text{Pt}}^{\text{2+}}+4{\text{Cl}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[{\text{PtCl}}_{4}]}^{2-}$$1 $$×$$ 1016
$${\text{Cu}}^{\text{2+}}+4\text{CN}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Cu}{(\text{CN})}_{4}]}^{2-}$$1.0 $$×$$ 1025
$${\text{Co}}^{\text{2+}}+4{\text{SCN}}^{\text{−}}\phantom{\rule{0.2em}{0ex}}⇌\phantom{\rule{0.2em}{0ex}}{[\text{Co}{(\text{SCN})}_{4}]}^{2-}$$$$×$$ 103

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## Test Your Knowledge | Examination Past Questions

How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?

### Options

A) 3.90 x 102 coulombs

B) 5.50 x 103 coulombs

C) 6.54 x 103 coulombs

D) 2.34 x 104 coulombs

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