The ionic mobilities of $\mathrm{NH}_{4}^{+}$and $\mathrm{HCO}_{3}^{-}$are $6 \times 10^{-4} \mathrm{V}^{-1} \mathrm{s}^{-1}$ and $5 \times 10^{-4} \mathrm{V}^{-1} \mathrm{s}^{-1}$, respectively. The transport numbers of $\mathrm{NH}_{4}^{+}$and $\mathrm{HCO}_{3}^{-}$are, respectively