
Concept explainers
(a)
Interpretation:
The more acidic group −NH3+ or −COOH in the neutral amino acid alanine needs to be determined.
Concept introduction:
Proteins are
(b)
Interpretation:
The percentage of each form-protonates (H2A+ ), neutral (HA) and deprotonated (A- ) in the aqueous solution at pH = 4.00 needs to be determined.
Concept introduction:
Proteins are biomolecules that are composed of certain monomer units such as amino acids. These are carboxylic acids with one amino group bonded on alpha-C atom of the molecule. These amino acids involve in condensation process to form peptides and polypeptides which further form complex protein molecules. Amino acids are the organic molecules with both
(c)
Interpretation:
The percentage of each form-protonates (H2A+ ), neutral (HA) and deprotonated (A- ) in the aqueous solution at pH = 8.50 needs to be determined.
Concept introduction:
Proteins are biomolecules that are composed of certain monomer units such as amino acids. These are carboxylic acids with one amino group bonded on alpha-C atom of the molecule. These amino acids involve in condensation process to form peptides and polypeptides which further form complex protein molecules. Amino acids are the organic molecules with both
(d)
Interpretation:
The pH at which the neutral form of alanine present in the maximum amount needs to be determined.
Concept introduction:
Proteins are biomolecules that are composed of certain monomer units such as amino acid. These are carboxylic acids with one amino group bonded on the alpha-C atom of the molecule. These amino acids involve in condensation process to form peptides and polypeptides which further form complex protein molecules. Amino acids are the organic molecules with both

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Chapter 23 Solutions
CHEMISTRY-MASTERINGCHEMISTRY W/ETEXT
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