Complete Table 6.1 to show the observations seen when the named reagent is added to aqueous cobalt(II) chloride.
Write an equation for the reaction of $[\text{Co}(\text{H}_2\text{O})_6]^{2+}$ ions with $\text{NaOH(aq)}$.
Write an equation for the reaction of $[\text{Co}(\text{H}_2\text{O})_6]^{2+}$ ions with an excess of concentrated $\text{HCl}$.
Define stability constant.
Write an expression for the stability constant, $K_{\text{stab}}$, of the $[\text{Co(NH}_3)_6]^{2+}$ complex ion.
State the units of the stability constant, $K_{\text{stab}}$, for the $[\text{Co(NH}_3)_6]^{2+}$ complex ion.
The numerical value of the stability constant, $K_{\text{stab}}$, for the $[\text{Co(NH}_3)_6]^{2+}$ complex ion is $7.7 \times 10^4$. In an aqueous solution, the concentration of the $[\text{Co(NH}_3)_6]^{2+}$ complex ion is $0.0740\text{ mol dm}^{-3}$ and the concentration of $\text{NH}_3$ is $0.480\text{ mol dm}^{-3}$ at equilibrium. Calculate the concentration of $[\text{Co}(\text{H}_2\text{O})_6]^{2+}$ in this solution.