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A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of NH4+ is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8 x 10-5, what is the pH of the solution?

(log 2.7 = 0.43)

(a) 9.43                    (b) 11.72

(c) 8.73                     (d) 9.08

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