Complete these electronic structures: • iron atom, Fe: $1s^22s^22p^6\,\ldots$ • iron(III) ion, $\text{Fe}^{3+}$: $1s^22s^22p^6\,\ldots$
Iron(III) salt solutions are acidic because of the equilibrium shown. $[\text{Fe(H}_2\text{O)}_6]^{3+}(aq) \rightleftharpoons [\text{Fe(H}_2\text{O)}_5(\text{OH})]^{2+}(aq) + \text{H}^+(aq)$ $K_a = 8.9 \times 10^{-4}\,\text{mol dm}^{-3}$ Calculate the pH of a $0.25\,\text{mol dm}^{-3}$ $\text{FeCl}_3$ solution.
What does the term stability constant, $K_{\text{stab}}$, mean?
Use the table data to predict the formula of the complex produced in the greatest amount when: • a solution containing equal concentrations of both $\text{F}^-$ and $\text{SCN}^-$ ions is added to $\text{Fe}^{3+}(aq)$, • a solution containing equal concentrations of both $\text{Fe}^{3+}$ and $\text{Hg}^{2+}$ ions is added to $\text{Cl}^-(aq)$.
The complex $[\text{Fe(ed)}_2\text{Cl}_2]^{3-}$ is formed according to the equation shown. $[\text{Fe(H}_2\text{O)}_4\text{Cl}_2]^+(aq) + 2\text{ed}^{2-}(aq) \rightleftharpoons [\text{Fe(ed)}_2\text{Cl}_2]^{3-}(aq) + 4\text{H}_2\text{O}(l)$ Write the expression for the equilibrium constant, $K_{\text{stab}}$, and state its units.
$[\text{Fe(ed)}_2\text{Cl}_2]^{3-}$ exhibits geometrical and optical isomerism. Complete the three-dimensional diagrams to show the three stereoisomers of $[\text{Fe(ed)}_2\text{Cl}_2]^{3-}$. You may use -O- -O- to represent ed$^{2-}$.
Give the letters of two isomers of $[\text{Fe(ed)}_2\text{Cl}_2]^{3-}$ that are geometrical isomers of each other.
Give the letters of the two isomers of $[\text{Fe(ed)}_2\text{Cl}_2]^{3-}$ that display optical isomerism.
Give the letter of the isomer with no dipole moment.