\( 1.0 \mathrm{~L} \) solution is prepared by mixing \( 61 \mathrm{~g} \) benzoic acid \( \left(...

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\( 1.0 \mathrm{~L} \) solution is prepared by mixing \( 61 \mathrm{~g} \) benzoic acid \( \left(p K_{a}=4.2\right) \) with \( 72 \mathrm{~g} \) of sodium benzoate and then \( 300 \mathrm{~mL} 1.0 \mathrm{M} \mathrm{HBr} \) solution was added. The \( \mathrm{pH} \) of final solution is:
(a) \( 3.6 \)
(b) \( 3.8 \)
(c) \( 4.2 \)
(d) \( 4.8 \)
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