4. You need to make a buffer with pH as close to 10.00 as possible. Two sets of weak acidsand conjugate bases, with the Ka values, are listed below. Which of the two sets wouldbe the best choice? You want a pka close to the pH. Explain your reasoning.CH:COOH/CH;coo HCO; /CO,2-Ka = 1.80 x 10sKa = 2.14 x 10-10%3D%3D5. 5 drops of a strong base (0.1 M concentration) was added to a buffer (pH = 7.0), with noapparent change in pH. An additional 5 ml of this strong base was added, and the pH ofthe solution increased to 13.0. Explain why there was no apparent change in pH in the%3Dfirst case, but a marked change in pH in the second case.

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4. You need to make a buffer with pH as close to 10.00 as possible. Two sets of weak acids and conjugate bases, with the Ka values, are listed below. Which of the two sets would be the best choice? You want a pKa close to the pH. Explain your reasoning. CH3COOH/CH3COO HCO3 /CO;? Ka = 1.80 x 105 Ka = 2.14 x 10-10

4. You need to make a buffer with pH as close to 10.00 as possible. Two sets of weak acids and conjugate bases, with the Ka values, are listed below. Which of the two sets would be the best choice? You want a pKa close to the pH. Explain your reasoning. CH3COOH/CH3COO HCO3 /CO;? Ka = 1.80 x 105 Ka = 2.14 x 10-10

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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You have been given 0.200 Molar solutions of hydrocyanic acid and potassium cyanide. The Ka of HCN = 4.9x10-10. If you wanted to make a buffer with a pH = 9.00, would you add a greater volume of the HCN solution or the KCN solution? More HCN equal amounts of each more KCN
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9 If the dissociation constant of a weak acid is 1.4 x 10-5, at what ratio should you adjust the concentration of the weak acid and its conjugate base in order to prepare a buffer that has a pH of 4.85? a) 0.100 M weak acid with 0.0100 M conjugate base b) 0.0100 M weak acid with 0.100 M conjugate base c) 0.100 M weak acid with 0.200 M conjugate base d) 0.300 M weak acid with 0.300 M conjugate base e) 0.500 M weak acid with 0.250 M conjugate base
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