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1. Calculate the pH at the following points in a titration of 40 mL (0.040 L) of 0.100 M barbituric acid C4H4N2O3 (Ka = 9.8× 10−5) with 0.100 M KOH. (a) no KOH added (b) 20 mL of KOH solution added (c) 39 mL of KOH solution added (d) 40 mL of KOH solution added (e) 41 mL of KOH solution added