Determine the oxidation state of cobalt in these complex ions.
Name the two reaction types that the cobalt ions undergo when these complex ions are formed.
The complex $[\text{Co(NH}_3)_4\text{Cl}_2]$ exhibits isomerism. Draw three-dimensional structures for the two isomers, and suggest the type of isomerism that is shown here.
What is meant by the term co-ordination number?
Complete the table by predicting suitable co-ordination numbers, formulae and charges for complexes C, D, E and F.
Iron(III) forms complexes in separate reactions with both SCN$^-$ ions and Cl$^-$ ions.\n\n$\text{Fe}^{3+}(aq) + \text{SCN}^-(aq) \rightleftharpoons [\text{FeSCN}]^{2+}(aq)$\n\n$\text{Fe}^{3+}(aq) + 4\text{Cl}^-(aq) \rightleftharpoons [\text{FeCl}_4]^-(aq)$\n\nWrite the expressions for the stability constants, $K_{stab1}$ and $K_{stab2}$, for these two equilibria. Include units in your answers.
A further equilibrium may be established between these two complexes, as shown.\n\n$[\text{FeCl}_4]^-(aq) + \text{SCN}^-(aq) \rightleftharpoons [\text{FeSCN}]^{2+}(aq) + 4\text{Cl}^-(aq)$\n\nWrite an expression for $K_{eq3}$ in terms of $K_{stab1}$ and $K_{stab2}$.
The values of these stability constants are given below.\n\n$K_{stab1} = 1.4 \times 10^2$\n\n$K_{stab2} = 8.0 \times 10^{-2}$\n\nCalculate the value of $K_{eq3}$ and state its units.