The pH of 0.350 M benzoic acid,HC₇H₅O₂,is 2.32.What is the pK_a for this acid?

Name: The pH of 0.350 M benzoic acid,HC 7 H 5 O 2 ,is 2.32.What is the pK a for this acid?
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Quizplus · Accepted Answer

The pH of the solution is 2.32, which means the concentration of H⁺ ions is 10^(-2.32). Using the formula pKa = pH + log([HA]/[A⁻]), and assuming [HA] ≈ initial concentration and [A⁻] ≈ [H⁺], we find pKa ≈ 4.18.

The PH of 0