A buffer solution is 0.418 M in HCN and 0.342 M in KCN. If Ka for HCN is 4.0 × 10^-10, what is the pH of this buffer solution? pH =

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A buffer solution is 0.418 M in HCN and 0.342 M in KCN. If Ka for HCN is 4.0 × 10^-10, what is the pH of this buffer solution? pH = A buffer solution is 0.387 M in H2S and 0.212 M in KHS. If Ka1 for H2S is 1.0 x 10^-7, what is the pH of this buffer solution? pH = A 1.00 liter solution contains 0.43 M hypochlorous acid and 0.56 M potassium hypochlorite. If 0.14 moles of barium hydroxide are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of barium hydroxide.): A. The number of moles of HCIO will increase. B. The number of moles of ClO-will decrease. C. The equilibrium concentration of H3O+ will remain the same. v D. The pH will remain the same. E. The ratio of [HClO]/[ClO-] will remain the same. A 1.00 liter solution contains 0.44 moles hydrofluoric acid and 0.34 moles sodium fluoride. If 0.17 moles of hydroiodic acid are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of hydroiodic acid.) A. The number of moles of HF will decrease. • B. The number of moles of F- will increase. c. The equilibrium concentration of H3O+ will increase. • D. The pH will remain the same. HF E. The ratio of [HF]/[F-] will remain the same.
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