The pH of a solution that contains 0.800 M acetic acid (K_a = 1.76 × 10^-⁵)and 0.172 M sodium acetate is ________. A)4.087 B)5.422 C)8.578 D)8.370 E)9.913

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Quizplus · Accepted Answer

The solution is a buffer system consisting of acetic acid and its conjugate base, sodium acetate. The pH can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). Here, pKa = -log(1.76 × 10^-5) = 4.755, [A-] = 0.172 M, and [HA] = 0.800 M. Substituting these values gives pH = 4.755 + log(0.172/0.800) = 4.087.

The PH of a Solution That Contains 0