Step 1. Calculate [H+]:
C6H5COOH ⇌ C6H5COO- + H+
x = 5.020x10-3 M = [H+]
What is the pH of a 0.40 M solution of benzoic acid, C6H5COOH? (The Ka value for benzoic acid is 6.3 x 10-5.)
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