4. aqueous iron (iii) ion and aqueous cn ions form the complexion fe(cn)6 (4) it has a kr value of 4 x 1045 a. write the net ionic equation for the complex ion formation. fe (ag) + cnias felone b. write the equilibrium (keq) equation. tnt c. what is the geometric shape of the complex ion fe(cn)6%"(ng)? d. what is the ion charge, of the metal in this complex ion? e. calculate the concentration of cn in a 0.150 m fe(cn)6(aq) solution.