2. (D) Vitamin 'C' or ascorbic acid is an essential nutrient for human beings and certain other animal species. Below is the structure of the ascorbic acid. Но но. Но The pKa of ascorbic acid (vitamin C) is 4.17, showing that it is slightly more acidic than acetic acid (CH3COOH, pK, 4.74). (a) Show the four different conjugate bases that would be formed by deprotonation of the four different OH groups in ascorbic acid. (b) Compare the stabilities of these four conjugate bases, and predict which OH group of ascorbic acid is the most acidic. (c) Compare the most stable conjugate base of ascorbic acid with the conjugate base of acetic acid, and suggest why these two compounds have similar acidities, even though ascorbic acid lacks the carboxylic acid (CO0H) group.
2. (D) Vitamin 'C' or ascorbic acid is an essential nutrient for human beings and certain other animal species. Below is the structure of the ascorbic acid. Но но. Но The pKa of ascorbic acid (vitamin C) is 4.17, showing that it is slightly more acidic than acetic acid (CH3COOH, pK, 4.74). (a) Show the four different conjugate bases that would be formed by deprotonation of the four different OH groups in ascorbic acid. (b) Compare the stabilities of these four conjugate bases, and predict which OH group of ascorbic acid is the most acidic. (c) Compare the most stable conjugate base of ascorbic acid with the conjugate base of acetic acid, and suggest why these two compounds have similar acidities, even though ascorbic acid lacks the carboxylic acid (CO0H) group.
Chemistry
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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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Transcribed Image Text:2. (D) Vitamin 'C' or ascorbic acid is an essential nutrient for human beings and
certain other animal species. Below is the structure of the ascorbic acid.
Но
но.
Но
The pKa of ascorbic acid (vitamin C) is 4.17, showing that it is slightly more acidic
than acetic acid (CH3COOH, pK, 4.74).
(a) Show the four different conjugate bases that would be formed by deprotonation
of the four different OH groups in ascorbic acid.
(b) Compare the stabilities of these four conjugate bases, and predict which OH
group of ascorbic acid is the most acidic.
(c) Compare the most stable conjugate base of ascorbic acid with the conjugate base
of acetic acid, and suggest why these two compounds have similar acidities, even
though ascorbic acid lacks the carboxylic acid (CO0H) group.
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