Calculate the pH of a solution that has a concentration of 0.190 M H₂S and 0.550 M KHS? The K_a of H₂S is 1.1 × 10^-7. A) 11.02 B) 7.49 C) 3.22 D) 7.42

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Quizplus · Accepted Answer

The solution is a buffer system consisting of H2S and its conjugate base KHS. Using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]), where pKa = -log(1.1 × 10^-7) ≈ 6.96. Substituting the concentrations, pH = 6.96 + log(0.550/0.190) ≈ 7.42.

Calculate the PH of a Solution That Has a Concentration