Calculate the mole ratio of C₆H₅COONa to C₆H₅COOH required to make a buffer with pH of 4.68. K_a of C₆H₅COOH is 6.3 × 10^-5. A) 0.122 B) 3.02 C) 0.75 D) 1.22 E) 10.0

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Quizplus · Accepted Answer

Using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). pKa = -log(6.3 × 10^-5) = 4.20. Therefore, 4.68 = 4.20 + log([A-]/[HA]). Solving gives [A-]/[HA] = 3.02.

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Calculate the Mole Ratio of C₆H₅COONa to C₆H₅COOH Required to Make