The structure of the most abundant form of cysteine at the given pH values is to be drawn. Concept introduction: The general form of an α-amino acid has both an amino group and a carboxylic group. In an aqueous solution, the amino group is weakly basic, and the carboxylic group is weakly acidic. Under highly acidic conditions, the N atom in the amino group is protonated. As the pH of the solution increases, the most acidic proton can be removed from the carboxylic group. As the solution becomes more basic, a proton from the side chain group is lost and the dominant form will be formed. As the solution becomes still more basic, the proton of the NH 3 + group is deprotonated. The strongest acid has the lowest pKa value, and the base has a higher pKa value.

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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 6, Problem 6.70P

Interpretation Introduction

Interpretation:

The structure of the most abundant form of cysteine at the given pH values is to be drawn.

Concept introduction:

The general form of an α-amino acid has both an amino group and a carboxylic group. In an aqueous solution, the amino group is weakly basic, and the carboxylic group is weakly acidic. Under highly acidic conditions, the N atom in the amino group is protonated. As the pH of the solution increases, the most acidic proton can be removed from the carboxylic group. As the solution becomes more basic, a proton from the side chain group is lost and the dominant form will be formed. As the solution becomes still more basic, the proton of the NH3+ group is deprotonated. The strongest acid has the lowest pKa value, and the base has a higher pKa value.

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Draw all of the structures of cysteine as the pH increases from low to high, then sketch a titration curve that best represents the titration of cysteine. in the curve, label each: x-axis, y-axis, pKa (COOH), pKa (NH3+), pKa(R-group), and the calculated pI value.

Answer 2

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 6, Problem 6.70P

Interpretation Introduction

Interpretation:

The structure of the most abundant form of cysteine at the given pH values is to be drawn.

Concept introduction:

The general form of an α-amino acid has both an amino group and a carboxylic group. In an aqueous solution, the amino group is weakly basic, and the carboxylic group is weakly acidic. Under highly acidic conditions, the N atom in the amino group is protonated. As the pH of the solution increases, the most acidic proton can be removed from the carboxylic group. As the solution becomes more basic, a proton from the side chain group is lost and the dominant form will be formed. As the solution becomes still more basic, the proton of the NH3+ group is deprotonated. The strongest acid has the lowest pKa value, and the base has a higher pKa value.

Expert Solution & Answer

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Answer 3

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 6, Problem 6.70P

Interpretation Introduction

Interpretation:

The structure of the most abundant form of cysteine at the given pH values is to be drawn.

Concept introduction:

The general form of an α-amino acid has both an amino group and a carboxylic group. In an aqueous solution, the amino group is weakly basic, and the carboxylic group is weakly acidic. Under highly acidic conditions, the N atom in the amino group is protonated. As the pH of the solution increases, the most acidic proton can be removed from the carboxylic group. As the solution becomes more basic, a proton from the side chain group is lost and the dominant form will be formed. As the solution becomes still more basic, the proton of the NH3+ group is deprotonated. The strongest acid has the lowest pKa value, and the base has a higher pKa value.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

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 6, Problem 6.70P

Interpretation Introduction