A 100mL solution of 1M glycine at pH 1.72 was titrated with 1MNaOH solution. The pH was monitored and the results were plotted as shown in the graph above. The key points in the titration are designated I to V. For each of the statements identify the appropriate key point in the titration. (Note that you should use each answer only once) The pHis equal to the pl of the COO - group A.1, it., V The average nel charge of glycine is +1 B. IIi The predominant species is +H3N-CH2-COO- C.IV These are the worst H regions for buffering power D.I The phis eqqual to the pKa of the NH+H+ group E