a) Acetic acid is a weak acid that dissociates into acetate ion and hydronium ions in solutions: CH3COOH(aq) + H2O(l) ⇌ H3O+(aq) + CH3COO-(aq) The value of the dissociation constant (Ka) for acetic acid is 1.78×10-5. If you require a buffer of pH 5.25, what would be the ratio of [CH3COO-]/[CH3COOH] that you would use? A 0.316 B 3.16 C 4.15 D 0.415 b) If you need to prepare a buffer with a pH of 8.8, which one of the following acid/conjugate base pairs would you choose? A HCN / KCN B HF / KF C CH3COOH / NaCH3COO D HClO / NaClO
a) Acetic acid is a weak acid that dissociates into acetate ion and hydronium ions in solutions: CH3COOH(aq) + H2O(l) ⇌ H3O+(aq) + CH3COO-(aq) The value of the dissociation constant (Ka) for acetic acid is 1.78×10-5. If you require a buffer of pH 5.25, what would be the ratio of [CH3COO-]/[CH3COOH] that you would use? A 0.316 B 3.16 C 4.15 D 0.415 b) If you need to prepare a buffer with a pH of 8.8, which one of the following acid/conjugate base pairs would you choose? A HCN / KCN B HF / KF C CH3COOH / NaCH3COO D HClO / NaClO
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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a) Acetic acid is a weak acid that dissociates into acetate ion and hydronium ions in solutions: CH3COOH(aq) + H2O(l) ⇌ H3O+(aq) + CH3COO-(aq) The value of the dissociation constant (Ka) for acetic acid is 1.78×10-5. If you require a buffer of pH 5.25, what would be the ratio of [CH3COO-]/[CH3COOH] that you would use?
A 0.316
B 3.16
C 4.15
D 0.415
b) If you need to prepare a buffer with a pH of 8.8, which one of the following acid/conjugate base pairs would you choose?
A HCN / KCN
B HF / KF
C CH3COOH / NaCH3COO
D HClO / NaClO
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