Reason for the carboxylic group of the amino acid is more acidic than a carboxylic acid of acetic acid has to be given. Concept Introduction: Acid-base properties of Amino acids: Every amino acid has a carbonyl group and an amino group, and each group can exist in an acidic form or a basic form, depending on pH of the solution in which the amino acid is dissolved. The compound exists primarily in the acidic form in solutions that are more acidic than their pK a values, and primarily in the basic form (without their protons) in solutions that are more basic than their pK a values.

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Definition Definition Class of organic compounds that contain a carboxyl group ( - COOH ) and has a general formula R - COOH or R - CO 2 H , where R refers to the alkyl, alkenyl, aryl, or other groups. They can undergo different chemical reactions, such as acid-base reactions, esterification, and oxidation. These are essential components of living organisms, playing important roles in metabolic processes, signaling, and as pharmaceuticals.

Chapter 17.3, Problem 4P

Interpretation Introduction

Interpretation:

Reason for the carboxylic group of the amino acid is more acidic than a carboxylic acid of acetic acid has to be given.

Concept Introduction:

Acid-base properties of Amino acids:

Every amino acid has a carbonyl group and an amino group, and each group can exist in an acidic form or a basic form, depending on pH of the solution in which the amino acid is dissolved.

The compound exists primarily in the acidic form in solutions that are more acidic than their pKa values, and primarily in the basic form (without their protons) in solutions that are more basic than their pKa values.

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In 0.1M solution glycine (pKa 9.6) at pH of 9.0, what fraction of glycine has its amino group in the -NH3+ form?

Net Charge on an Amino Group.The amino acid glycine has hydrogen as its side-chain (R) group. Values of pKca= 2:36 and pKaa=9:56 have been previously reported for glycine. Superscripts c, a, and s refer to a-carboxylic acid, α-amino base, and side chain, respectively. Using these values, determine the net charge on the a-amino group of glycine at a physiologic pH of 7.2 and a pH of 3 [70].

A naturally occurring amino acid such as alanine has a group that is a carboxylic acid and a group that is a protonated amine. a. If the pKa value of a carboxylic acid such as acetic acid is about 5 (see Table 2.1), then why is the pKa value of the carboxylic acid group of alanine so much lower? b. Draw the structure of alanine in a solution at pH = 0. c. Draw the structure of alanine in a solution at physiological pH (pH 7.4). d. Draw the structure of alanine in a solution at pH = 12. e. Is there a pH at which alanine is uncharged (that is, neither group has a charge)? f. At what pH does alanine have no net charge (that is, the amount of negative charge is the same as the amount of positive charge)?

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Definition Definition Class of organic compounds that contain a carboxyl group ( - COOH ) and has a general formula R - COOH or R - CO 2 H , where R refers to the alkyl, alkenyl, aryl, or other groups. They can undergo different chemical reactions, such as acid-base reactions, esterification, and oxidation. These are essential components of living organisms, playing important roles in metabolic processes, signaling, and as pharmaceuticals.

Chapter 17.3, Problem 4P

Interpretation Introduction

Interpretation:

Reason for the carboxylic group of the amino acid is more acidic than a carboxylic acid of acetic acid has to be given.

Concept Introduction:

Acid-base properties of Amino acids:

Every amino acid has a carbonyl group and an amino group, and each group can exist in an acidic form or a basic form, depending on pH of the solution in which the amino acid is dissolved.

The compound exists primarily in the acidic form in solutions that are more acidic than their pKa values, and primarily in the basic form (without their protons) in solutions that are more basic than their pKa values.

Expert Solution & Answer

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Answer 3

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Definition Definition Class of organic compounds that contain a carboxyl group ( - COOH ) and has a general formula R - COOH or R - CO 2 H , where R refers to the alkyl, alkenyl, aryl, or other groups. They can undergo different chemical reactions, such as acid-base reactions, esterification, and oxidation. These are essential components of living organisms, playing important roles in metabolic processes, signaling, and as pharmaceuticals.

Chapter 17.3, Problem 4P

Interpretation Introduction

Interpretation:

Reason for the carboxylic group of the amino acid is more acidic than a carboxylic acid of acetic acid has to be given.

Concept Introduction:

Acid-base properties of Amino acids:

Every amino acid has a carbonyl group and an amino group, and each group can exist in an acidic form or a basic form, depending on pH of the solution in which the amino acid is dissolved.

The compound exists primarily in the acidic form in solutions that are more acidic than their pKa values, and primarily in the basic form (without their protons) in solutions that are more basic than their pKa values.

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 4

Question

Definition Definition Class of organic compounds that contain a carboxyl group ( - COOH ) and has a general formula R - COOH or R - CO 2 H , where R refers to the alkyl, alkenyl, aryl, or other groups. They can undergo different chemical reactions, such as acid-base reactions, esterification, and oxidation. These are essential components of living organisms, playing important roles in metabolic processes, signaling, and as pharmaceuticals.

Chapter 17.3, Problem 4P

Interpretation Introduction