A sample which is having 0.552g of ascorbic acid was dissolved in the water to a total volume of 20mL and titrated with the 0.1103 M KOH and the equivalence point occurred when the 28.42 ml of base is added. The pH of the solution at 10mL of added base was 3.72.
1. Calculate the molar mass of vitamin C
2. Calculate the Ka of vitamin C