3. Using the literature value of Ka for ascorbic acid, determine the theoretical pH at the start of the titration. Compare this value both quantitatively and qualitatively with your experimental value (hint: use % error calculation)? Post-Lab Questions (5 marks) A titration curve of Na2CO3 titrated with HCl(aq) is shown below. Answer the following questions. 3. Using the literature value of Ka for ascorbic acid, determine the theoretical pH at the start of the titration. Compare this value both quantitatively and qualitatively with your experimental value (hint: use % error calculation)? Post-Lab Questions (5 marks) A titration curve of Na2CO3 titrated with HCl(aq) is shown below. Answer the following questions