For the following lab, the purpose is to utilize titration to determine the amount of ascorbic acid (vitamin C) present in a substance by reacting it with potassium bromate. An oxidation reaction takes place with ascorbic acid to produce dehydroascorbic acid, using an excess of bromine. The total amount of bromine utilized during the experiment is determined utilizing a back titration, in which the bromine is reacted with bromate. One mole of bromate produces three moles of bromine and the excess amount of bromine is determined by converting an excess of I- to I2, with potassium iodine, in which iodine is determined using a back titration. One mole of Br2 produces one mole of I2 and one mole of I2 requires two moles of S2O32-. 1. Dry 1.5 g
