Calculate the pH of a buffer solution that contains 0.25 M benzoic acid (C6H5CO2H) and 0.15M sodium benzoate (C6H5COONa) . [Ka = 6.5 * 10-5 for benzoic acid]
A) 3.97
B) 4.83
C) 4.19
D) 3.40
E) 4.41
Correct Answer:
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