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AP Chemistry
8.9 Henderson-Hasselbalch Equation
8.7 pH and pKa
IntermediateMCQMathematicalConceptual15.8k
Benzoic acid, \(\text{C}_6\text{H}_5\text{COOH}\), is a weak monoprotic acid with a \(\text{p}K_a\) of \(4.20\). A student prepares an aqueous solution of benzoic acid and adds a small volume of concentrated \(\text{NaOH(aq)}\) until the \(\text{pH}\) of the solution reaches \(6.20\). Which of the following correctly predicts the predominant benzoic acid species present in the final solution and the value of the ratio \(\dfrac{[\text{C}_6\text{H}_5\text{COO}^-]}{[\text{C}_6\text{H}_5\text{COOH}]}\)?

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