One litre buffer solution was prepared by adding 0.10 mol each of NH_3 and NH_4 Cl in deionised water. The change in pH on addition of 0.05 mol of…

One litre buffer solution was prepared by adding $\displaystyle 0.10$ mol each of $\displaystyle \mathrm{NH}_3$ and $\displaystyle \mathrm{NH}_4 \mathrm{Cl}$ in deionised water. The change in pH on addition of $\displaystyle 0.05$ mol of HCl to the above solution is $\displaystyle \_\_\_\_$ $\displaystyle \times 10^{-2}$. (Nearest integer)Given : $\displaystyle \mathrm{pK}_{\mathrm{b}}$ of $\displaystyle \mathrm{NH}_3=4.745$ and $\displaystyle \log _{10} 3=0.477$