Chemistry - Ionic Equilibrium Question with Solution | TestHub

Paragraph for Q.5 to Q.6

The amino acid alanine (${\mathrm{NH}}_2\text{-}\mathrm{CH}({\mathrm{CH}}_3)\text{-}\mathrm{COOH}$) exists as a zwitterion in aqueous solution. For the zwitterion $\left[{\mathrm{NH}}_3^{+}\text{-}\mathrm{CH}({\mathrm{CH}}_3)\text{-}{\mathrm{COO}}^{-}\right]$ at $25^{\circ }\mathrm{C}$, the acid constant of the $\text{-}{\mathrm{NH}}_3^{+}$ group is $K_a=2.0\times 10^{-10}$ ($\mathrm{p}{K}_a=9.7$) and the base constant of the $\text{-}{\mathrm{COO}}^{-}$ group is $K_b=5.0\times 10^{-12}$ ($\mathrm{p}{K}_b=11.3$).