Introduction To General, Organic, And Biochemistry
Introduction To General, Organic, And Biochemistry
12th Edition
ISBN: 9781337571357
Author: Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher: Cengage Learning
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Chapter 17, Problem 33P
Interpretation Introduction

Interpretation:

The form of ascorbic acid and ascorbate anion in blood plasma should be determined.

Concept Introduction:

For an acid HA; the acid dissociation reaction can be written as.

HA+H2OA+H3O+

The acid dissociation constant (Ka) is the ratio of product and reactant for the acid dissociation reaction. Hence it can be written as;.

Ka=[A][H3O+][HA]

Henderson-Hasselbalch equation purposed the relation between pH and pKa for weak acids:

pH=pKa+log[A][HA].

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The Ka1 of ascorbic acid is 7.94 x 10-5. Would you expect ascorbic acid dissolved in blood plasma (pH 7.35–7.45) to exist primarily as ascorbic acid or as ascorbate anion? Explain.
Give at least 5 examples of biological compounds having a carboxylic acid functional group and identify the biochemical importance of each compound.
The Ka1 of ascorbic acid is 7.94 x 10°. Would you expect ascorbic acid dissolved in blood plasma (pH 7.35-7.45) to exist primarily as ascorbic acid or as ascorbate anion? From the choices provided below, indicate whether the carboxylic acid will exist primarily in its protonated form as a Free Acid or in its deprotonated form as a Carboxylate Anion by clicking on the corresponding button. At equilibrium in this pH, the concentration of the preferred form of the acid is approximately times higher than the concentration of its conjugate form. Round to the nearest order of magnitude.

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Introduction To General, Organic, And Biochemistry

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