A 100 ml solution of 0.1 M glycine at pH 1.72 was titrated with 2 M LIOH. The pH was monitored and the result were plotted as shown in the graph. The key points of the titration are designated as I to V. Identify the key point in the titration corresponding to the pH at which the carboxyl group is half deprotonated. 12 J130 10 9.60 (IV) 8 pH 6-597 4 234 2. 05 1.0 1.5 2.0 OH (equivalents) IV O l and IV Next

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