The graph represents the titration of an amino acid with NaOH solution. A. At what pH is the average net charge 1/2 ? below pH2.34 at pH=9.69 at pH=2.34 at pH=6.01 above pH9.69 C. At what point has enough base been added to react with 1/2 of the NH3+groups? 1/2 of NH3+reacted when 1/2 of NH3+has reacted, the pH= D. At which pH value does the amino group of amino acid have the best buffering capacity? D. At which pH value does the amino group of amino acid have the best buffering capacity? 9.69 1.53 3.00 10.5 9.00 6.01 E. What is the pI (isoelectric point)