Introduction to Titration Practice Test

A weak base, $\mathrm{B(aq)}$, is titrated with a strong acid, $\mathrm{HCl(aq)}$. The titration passes through the initial solution (mostly $\mathrm{B}$), buffering region (mixture of $\mathrm{B}$ and $\mathrm{BH^+}$), equivalence region (all $\mathrm{B}$ converted to $\mathrm{BH^+}$), and post-equivalence (excess $\mathrm{H_3O^+}$).

At the equivalence region, which species is expected to predominate (ignoring spectator ions)?

A weak base–strong acid titration is performed by adding $\mathrm{HCl(aq)}$ to $\mathrm{B(aq)}$. Before the equivalence point, the solution contains both $\mathrm{B}$ and $\mathrm{BH^+}$.

If the student adds a small additional amount of $\mathrm{HCl(aq)}$ while still before equivalence, what is the best qualitative prediction for the pH change?