Solution Found!
Draw the form of l-glutamic acid that predominates at each
Chapter 25, Problem 25.47(choose chapter or problem)
Draw the form of l-glutamic acid that predominates at each pH: (a) 1.9 (b) 2.4 (c) 5.8 (d) 10.4
Questions & Answers
QUESTION:
Draw the form of l-glutamic acid that predominates at each pH: (a) 1.9 (b) 2.4 (c) 5.8 (d) 10.4
ANSWER:Step 1 of 5
The structure of L-glutamic acid is:
L-Glutamic acid has three sites which contain acidic / basic protons: the two carboxylic acids and one amine group. The carboxylic acid has a \(\mathrm{pK_a}\) value of 2.10, the ammonium group has a \(\mathrm{pK_a}\) value of 9.67, and the side chain (the other carboxylic acid) has a \(\mathrm{pK_a}\) value of 4.25. If the pH is below a given \(\mathrm{pK_a}\) value, the species with that \(\mathrm{pK_a}\) value will exist predominately in its protonated form.