A volume of 25.0 mL of 0.100 M C_6H_5CO_2H(aq) is titrated with 0.100 M NaOH(aq). What is the pH after the addition of 12.5 mL of NaOH? (K_a of benzoic acid = 63 times 10^-5) 2.60 4.20 5.40 7.00 8.60
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