Within the list shown below, the correct pair of structures of alanine in pH ranges 2-4 and 9-11 is: I. H3N+ − CH(CH3)CO2H II. H2N − CH(CH3)CO2– III. H3N+ − CH(CH3)CO2

Engineering

Chemistry

pH Calculation for Acids and Bases

Amino acids

Dissociation Constant and Acidity Order

Question

Within the list shown below, the correct pair of structures of alanine in pH ranges 2-4 and 9-11 is:

I. H₃N+ − CH(CH₃)CO₂H

II. H₂N − CH(CH₃)CO₂^–

III. H₃N⁺ − CH(CH₃)CO₂^–

IV. H₂N − CH(CH₃)CO₂H

I and II

I and III

II and III

III and IV

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The correct pair of structures of alanine in pH ranges 2-4 and 9-11 is

I. H₃N⁺ − CH(CH₃)CO₂H

II. H₂N − CH(CH₃)CO₂⁻

In pH range 2-4, the medium is acidic and the amino group is protonated.

In pH range 9-11, the medium is basic and carboxylic group is deprotonated.