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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, \( \mathrm{K}_{\mathrm{b}} \) for \( \mathrm{NH}_{3} \) equals \( 1.8 \times 10^{-5} \), what is the \( \mathrm{pH} \) of this solution ? \( (\log 2.7=0.433) \).
(a) \( 9.08 \)
(b) \( 9.43 \)
(c) \( 11.72 \)
(d) \( 8.73 \)
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