What do the terms bidentate and ligand mean?
Three isomeric complex ions have the formula $[\text{Cr(en)}_2\text{Cl}_2]^+$. Finish the three-dimensional diagrams of the isomers in the boxes. en may be used as the abbreviation for en.
Write the expressions for the stability constants, $K_{\text{stab}1}$ and $K_{\text{stab}2}$, for equilibria 1 and 2, and include units in your answers. Equilibrium 1: $\text{Cu}^{2+}\text{(aq)} + 4\text{NH}_3\text{(aq)} \rightleftharpoons [\text{Cu(NH}_3)_4]^{2+}\text{(aq)}$ Equilibrium 2: $\text{Cu}^{2+}\text{(aq)} + 2\text{en(aq)} \rightleftharpoons [\text{Cu(en)}_2]^{2+}\text{(aq)}$
Give an expression for the equilibrium constant, $K_{\text{eq}3}$, in terms of $K_{\text{stab}1}$ and $K_{\text{stab}2}$, for equilibrium 3. $[\text{Cu(NH}_3)_4]^{2+}\text{(aq)} + 2\text{en(aq)} \rightleftharpoons [\text{Cu(en)}_2]^{2+}\text{(aq)} + 4\text{NH}_3\text{(aq)}$
The stability constants are given as $K_{\text{stab}1} = 1.2 \times 10^{13}$ and $K_{\text{stab}2} = 5.3 \times 10^{19}$. Calculate the value of $K_{\text{eq}3}$ and state its units.
Explain why $\Delta S^\circ_{\text{eq}2}$ is so different from $\Delta S^\circ_{\text{eq}1}$.
Calculate the value of $\Delta G^\circ_{\text{eq}2}$ at $298\,\text{K}$.
What conclusion can be drawn about the relative feasibility of equilibria 1 and 2? Explain your answer.
Using the data in the table, suggest a value of $\Delta H^\circ$ for equilibrium 3.
State the reaction type taking place in equilibrium 2.