Analysis of Vitamin C Commercial vitamin C containing 100 mg per tablet can be used. Perform the following analysis three times, and find the mean value (and relative standard deviation) for the number of milligrams of vitamin C per tablet. 1. Dissolve two tablets in 60 mL of 0.3 M H2SO4, using a glass rod to help break the solid. (Some solid binding material will not dissolve.) 2. Add 2 g of solid KI and 50.00 mL of standard KIO3. Then titrate with standard thiosulfate as above. Add 2 mL of starch indicator just before the end point. How do I determine the ascorbic acid content of the vitamin C tablet?