$\left. \begin{matrix} nitrikasid:\alpha =1\Rightarrow \left[ {{H}^{+}} \right]=0/2  \\ astikasid:\left\{ \begin{matrix} \alpha =0/0125  \\ M=0/1  \\ \end{matrix}\Rightarrow \left[ {{H}^{+}} \right]=0/0125\times 0/1=1/25\times {{10}^{-3}} \right.  \\ \end{matrix} \right\}\Rightarrow \frac{0/2}{1/25\times {{10}^{-3}}}=\frac{200}{1/25}=160$