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495 Chapter 22 Biochemistry Data Interpretation and Analysis 22.98 OH H OH H C H OH C C H C H C OH H C C H C C OH C 0 H₂C H H H OH (c) Typical values for carboxylic acids range from 2-4. The pKₐ of the carboxylic acid side chain of glutamic acid is 2.10. At pH 6, the carboxylic acid side chain of glutamic acid is ionized (i.e., deprotonated), as shown in the structure below. H protein backbone N CH C protein backbone CH₂ side chain of CH₂ glutamic acid O Copyright © 2017 Pearson Education, Inc.