Question
Attempt titrating an amino acid against a weak base and discover the number of dissociating ( ionizable ) functional groups in the amino acid.
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This can be done using a pH meter. \[ \text{{ Show more…
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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.
MATHEMATICAL Sketch a titration curve for the amino acid lysine, and indicate the $\mathrm{p} K_{\mathrm{a}}$ values for all titratable groups. Also indicate the $\mathrm{pH}$ at which the amino acid has no net charge.
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.
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