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Question: Calculate the pH of a buffer solution which contains 0.25 M benzoic acid (C6H5CO2H) and 0.15 M sodium benzoate (NaC6H5CO2). Given Ka = 6.5 x 10^-5.
a. 3.97b. 4.83c. 4.19d. 3.40e. 4.41
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