(20 points) Calculate the pH at the following points in a titration of 40 mL (0.040 L) of 0.100 M barbituric acid (C4H4N2O3) with 0.100 M KOH. (a) no KOH added (b) 15 mL of KOH solution added by 42 mL of KOH solution added 4 C4H4N203H30* + C4H3N2O3 ka = 9.8 x 10-5

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