(a(i))[1]
Calculate the solubility of $\text{Fe(OH)}_3$ in water.
(a(ii))[2]
Calculate the solubility of $\text{Fe(OH)}_3$ in $0.010\,\text{mol dm}^{-3}$ barium hydroxide, $\text{Ba(OH)}_2\text{(aq)}$.
(a(iii))[1]
Compared with pure water, $\text{Fe(OH)}_3$ is less soluble in $\text{Ba(OH)}_2\text{(aq)}$. What is the name of this effect?
(b(i))[1]
What is meant by conjugate acid-base pair?
(b(ii))[1]
Identify the two conjugate acid-base pairs in the equation $\text{HBrO} + \text{H}_2\text{O} \rightleftharpoons \text{BrO}^- + \text{H}_3\text{O}^+$.
(b(iii))[2]
Calculate the pH of solution $X$. Show your full working.
(b(iv))[1]
A buffer solution is produced when $2.00 \times 10^{-3}\ \text{mol}$ of $\text{NaOH}$ is added to solution $X$. Calculate the pH of this buffer solution.