At 25°C, 20.0 mL of 0.2 M weak monoprotic acid HX is titrated against 0.2 M NaOH. The pH of the solution (a) at the start of the titration (when NaOH…

At $\displaystyle 25$°C, $\displaystyle 20.0$ mL of $\displaystyle 0.2$ M weak monoprotic acid HX is titrated against $\displaystyle 0.2$ M NaOH. The pH of the solution (a) at the start of the titration (when NaOH has not been added) and (b) when $\displaystyle 10$ mL of NaOH is added respectively, are : Given : $$\begin{aligned} & \mathrm{K}_{\mathrm{a}}=5 \times 10^{-4} \\ & \mathrm{pK}_{\mathrm{a}}=3.3 \\ & \alpha \ll 1 \end{aligned} $$ (a) (b)