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What is the pH of 1.00 L sample of a buffer solution containing 0.10 mol of benzoic acid and 0.10 mol of sodium benzoate of which 0.010 mol of NaOH has been added ?
[`K_a` benzoic acid=`6.5xx10^(-5)`]
A. 4.27
B. 4.23
C. 4.15
D. `4.10`

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