In the presence of CN–, Fe3+ forms the complex ion
[Fe(CN)6]
3–. The equilibrium concentrations of Fe3+ and
[Fe(CN)6]
3– are 8.5 × 10–40 M and 1.5 × 10–3 M,
respectively, in a 0.11 M KCN solution. Calculate the
value for the overall formation constant of [Fe(CN)6]
3–