What is the \( \mathrm{pH} \) of a buffer solution which is \( 0.25...

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What is the \( \mathrm{pH} \) of a buffer solution which is \( 0.250 \mathrm{M} \)
P in benzoic acid, \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH} \) and \( 0.150 \mathrm{M} \) in sodium

W benzoate, \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COONa} \), if \( \mathrm{Ka} \) for benzoic acid is \( 6.5 \times 10^{-5} ? \)
(1) 3.40
(2) 3.97
(3) 4.19
(4) 4.41
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