A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of NH+4 is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8 $ \times $ 10$-$5, what is the pH of this solution? (log 2.7 = 0.43)

Question

A buffer solution is prepared in which the concentration of NH₃ is 0.30 M and the concentration of NH⁺₄ is 0.20 M. If the equilibrium constant, K_b for NH₃ equals 1.8 $ \times $ 10^$-$5, what is the pH of this solution? (log 2.7 = 0.43)