The graph below represents the titration of an amino acid with NaOH solution. View the titration…
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Question “The graph below represents the titration of an amino acid with NaOH solution. View the titration…”
The graph below represents the titration of an amino acid with NaOH solution. View the titration and answer the questions below (parts a through e) 2 (a) At what pH is the average net charge -12? 2 Number –PKz 9.6 2.00 pl-6.01 pH 8- (b) Where does the amino acid have a net charge of +1? O below pH 2.34 O at pH- 2.34 O at pH 6.01 O at pH 9.69 O above pH 9.69 pKi 2.34 1.0 1.5 2.0 OH (oquivalents) (c) At what point has enough base been added to react with 2 of the NH3′ groups? continued
Answer
(a). Half of the amine group are ionized to pH=pKa amine (pKa amine = 9.69). (6) Amino acids have a net charge of -1 when dissociable protons and base are fully titrated. It is therefore above pH=9.69 (c). Half of the ammonium ion reacts at equilibrium where there are equal amounts of protonated amine groups and deprotonated ones. pH = 9.69 Equivalence to OH-= 1.5 Equivalence to OH- (d). pH = 9.69 (e) is the best pH for buffering an amino acid. The average of two pKa values (pI = midpoint on the graph, pI= 6.01) is the isoelectric point.
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