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Question

A buffer solution is prepared in which the concentration of NH3 is 0.30M and the concentration of NH+4 is 0.20M. If the equilibrium constant, Kb for NH3 equals 1.8×105, what is the pH of this solution?

(log2/3=0.176)

A
9.43
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B
11.72
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C
8.73
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D
9.08
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