O) For a weak acid with a pKa of 5.5, at what pH would there be a 10-fold excess of theprotonated relative to the unprotonated form?a. 7.5b. 6.5c. 5.5d. 4.5e. 3.5At pH 5.2, a weak acid presents a 100-fold excess of [A-] relative to [HA]. What is thepKa of that weak acid?a. 7.2b. 6.2c. 5.2d. 4.2e. 3.2

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O) For a weak acid with a pKa of 5.5, at what pH would there be a 10-fold excess of the protonated relative to the unprotonated form? a. 7.5 b. 6.5 c. 5.5 d. 4.5 e. 3.5

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

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Question

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O) For a weak acid with a pKa of 5.5, at what pH would there be a 10-fold excess of the
protonated relative to the unprotonated form?
a. 7.5
b. 6.5
c. 5.5
d. 4.5
e. 3.5
At pH 5.2, a weak acid presents a 100-fold excess of [A-] relative to [HA]. What is the
pKa of that weak acid?
a. 7.2
b. 6.2
c. 5.2
d. 4.2
e. 3.2

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