Concentration Zwitterionic form Both groups deprotonated Both groups protonated 0 2 4 6 8 10 12 14 pH The figure shows the titration curve for a typical amino acid lacking a charged R group. Examine the graph and determine the pKa for the carboxyl group and the amino group of this amino acid.
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Figure 3.2 shows the titration curve for a typical amino acid lacking a charged R group. Examine the graph, and determine the $\mathrm{p} K_{\mathrm{a}}$ for the carboxyl group and the amino group of this amino acid.
MATHEMATICAL Sketch a titration curve for the amino acidd cysteine, and indicate the $\mathrm{p} K_{\mathrm{a}}$ values for all titratable groups. Also indicate the $\mathrm{pH}$ at which this amino acid has no net charge.
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