Question 66 of 246

A buffer solution is prepared in which the concentration of NH3 is 0.3 M and the concentration of NH4+ is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8x10-5, what is the pH of this solution?  (log 2.7 = 0.43)                                                                                     

(a) 9.43                               (b) 11.72

(c) 8.73                               (d) 9.08