You are given a solution wherein [OH^-] is 1/4th of the concentration of [H^+]. What is the pH of this solution? 2)What is the change in pH when a few drops of strong base containing 3.0 x 10^-3moles of [OH^-] is added to a liter of either of the following two buffered solutions at pH6.4 (you can assume the volume remains approximately constant) i) a 250 mM solution of buffer A (pKa = 5.0) ii) a 250 mM solution of buffer B (pKa = 7.2) 3. Which solution is the more effective buffer at pH 6.40(provide a rationale for your answer)?
You are given a solution wherein [OH^-] is 1/4th of the concentration of [H^+]. What is the pH of this solution? 2)What is the change in pH when a few drops of strong base containing 3.0 x 10^-3moles of [OH^-] is added to a liter of either of the following two buffered solutions at pH6.4 (you can assume the volume remains approximately constant) i) a 250 mM solution of buffer A (pKa = 5.0) ii) a 250 mM solution of buffer B (pKa = 7.2) 3. Which solution is the more effective buffer at pH 6.40(provide a rationale for your answer)?
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter13: Acids And Bases
Section: Chapter Questions
Problem 191MP
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1) You are given a solution wherein [OH^-] is 1/4th of the concentration of [H^+]. What is the pH of this solution?
2)What is the change in pH when a few drops of strong base containing 3.0 x 10^-3moles of [OH^-] is added to a liter of either of the following two buffered solutions at pH6.4 (you can assume the volume remains approximately constant)
i) a 250 mM solution of buffer A (pKa = 5.0)
ii) a 250 mM solution of buffer B (pKa = 7.2)
3. Which solution is the more effective buffer at pH 6.40(provide a rationale for your answer)?
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Step 1: Interpretation of problem statement
VIEWStep 2: Determine pH of solution.
VIEWStep 3: Determine [A-] and [HA] for buffer a
VIEWStep 4: Determine change in pH for buffer A
VIEWStep 5: Determine [A-] and [HA] for buffer B
VIEWStep 6: Determine change in pH for buffer B
VIEWStep 7: Determine which buffer is effective.
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