(a)[3]
The carbonates and hydroxides of Group 2 elements show alike patterns in thermal stability. Suggest and explain how the trend in the thermal stability of the Group 2 hydroxides changes.
(b(i))[1]
Write an equation to show how calcium hydroxide, $\text{Ca(OH)}_2$(s), dissociates in aqueous solution. Include state symbols.
(b(ii))[2]
Calculate the solubility, in $\text{mol dm}^{-3}$, of $\text{Ca(OH)}_2$. Use $K_{sp}$ for $\text{Ca(OH)}_2$, $5.02 \times 10^{-6}\,\text{mol}^3\,\text{dm}^{-9}$.
(b(iii))[1]
Suggest how the solubility of $\text{Ca(OH)}_2$ in aqueous $\text{NaOH}$ compares with its solubility in water. Explain your answer.