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IMMNAUEL LUTHERAN COLLEGE S6 Chemistry Name: Lam Kong Lan ( 7 ) Experiment 7 : Analysis of commercial vitamin C tablet Title: Determination of the vitamin C content (ascorbic acid) of a commercial vitamin C tablet and compare the result with the value specified by the manufacturer. Theory : In this experiment, we have to determine the vitamin C content of a commercial vitamin C tablet which is the mass of ascorbic acid in the tablet. As iodine is a weak oxidizing agent used mainly for the determination of strong reducing agents, ascorbic acid C6H8O6 (aq) can be rapidly and quantitatively oxidized by iodine in acidic condition as shown in the following equation: I2(aq) + C6H8O6 (aq) › C6H6O6 (aq) + 2H+ (aq) + 2I- (aq) This method involves the direct titration of the ascorbic acid with a standard iodine solution in an acidic medium. However, iodine is not very soluble in...

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