Chemistry - Ionic Equilibrium Question with Solution | TestHub

A buffer solution is prepared in which the concentration of ${\mathrm{NH}}_3$ is $0.30\mathrm{M}$ and the concentration of ${\mathrm{NH}}_4^{+}$is $0.20\mathrm{M}$. If the equilibrium constant, $K_b$ for ${\mathrm{NH}}_3$ equals $1.8\times 10^{-5}$, what is the $\mathrm{pH}$ of this solution? $(\log 2.7=0.43)$NEET 2011 (Screening)