Calculate the pH of a buffer solution that contains 0.25 mol benzoic acid (C6H5COOH) / Litre and 0.15 mol sodium benzoate (C6H5COONa) / Litre. [Ka = 6.5 x 10-5 for benzoic acid]
Solution is found using formula pH = pKa + log(Base/Acid).
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