Where calculations are repetitive, they should be shown in detail for one solution only, with the rest of the results summarized in the appropriate table. Comparison of Ka(5 marks) 1. Calculate an experimental average Ku from the values you obtained in the experiment, and determine the precision of your Ka values. ( 2 marks) 2. Compare your average value of Ka for ascorbic acid both qualitatively and quantitatively with the literature value of Ka (given to you in the experiment). How does the Ka value obtained at the half-titration point compare with the literature value- is it a valid simplified method to use a half-titration point to approximate Kn ?. (3 marks) 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. 4. Determine graphically the pH at ALL equivalence points of the titration and half-titration points. (Show these on the graph and list below).Q ( 3 marks) 5. Using the first half-titration point, determine the Kb1 value for the unknown acid and compare this value qualitatively to the literature value of 2.1104 for the carbonate ion. (Reminder: Kw=1.01014)(2marks)