$(2)$ $\mathrm{H}_{3} \mathrm{BO}_{3}$ is weak, non-protonic, lewis acid
$(3)$ $\mathrm{H}_{3} \mathrm{BO}_{3}+\mathrm{Na}\left(\mathrm{B}(\mathrm{OH})_{4}\right) \rightarrow$ equimolar amounts are produced and $\mathrm{pH}=\mathrm{pKa}\left(\mathrm{H}_{3} \mathrm{BO}_{3}\right)=9.25,$ lies in basic range.
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$(i)$ $\begin{gathered}
HCN\left( {aq} \right) + {H_2}O\left( l \right) \rightleftharpoons {H_3}{O^ + }\left( {aq} \right) + C{N^ - }\left( {aq} \right) \hfill \\
{K_a} = 6.2 \times {10^{ - 10}} \hfill \\
\end{gathered} $
$(ii)$ $\begin{gathered}
C{N^ - }\left( {aq} \right) + {H_2}O\left( l \right) \rightleftharpoons HCN\left( {aq} \right) + O{H^ - }\left( {aq} \right) \hfill \\
{K_b} = 1.6 \times {10^{ - 5}} \hfill \\
\end{gathered} $
These equilibria show the following order of the relative base strength
