Determination of the vitamin C content of a commercial vitamin C tablet and compare the result with the value specified by the manufacturer.

IMMNAUEL LUTHERAN COLLEGE S6 Chemistry Name: Hramar ( 7 ) Experiment 7 : summary of commercial vitamin C domiciliation Title: purpose of the vitamin C theme (ascorbic panelling) of a commercial vitamin C tablet and compare the result with the mensurate specified by the manufacturer. possible action : In this test, we have to determine the vitamin C content of a commercial vitamin C tablet which is the mass of ascorbic cutting in the tablet. As one is a weak oxidizing divisor utilize mainly for the determination of strong reducing agents, ascorbic acid C6H8O6 (aq) keep abreast be rapidly and quantitatively oxidized by union in acidic condition as shown in the enkindle equation: I2(aq) + C6H8O6 (aq) ? C6H6O6 (aq) + 2H+ (aq) + 2I- (aq) This manner involves the direct titration of the ascorbic acid with a cadence one solution in an acidic medium. However, tincture of iodine is not very soluble in water (0.001M) , this makes the method less(prenominal) than ideal. Instead of dissolving solid iodine in water, we passel obtain unneeded quantity of iodine solution by adding an unmeasured excess of potassium iodide solution to a go volume of an acidified standard potassium iodate solution according to the interest equation: IO3-(aq) + 5 I- (aq) + 6 H+ (aq) 3I2 (aq) + 3H2O (l) Then the experiment is right away followed by a back titration of the excess liberated iodine with standard sodium thiosulphate solution as shown below: I2 (aq) + 2S2O32- (aq) ? 2I- (aq) + S4O62- (aq) With iodine solution, the thiosulphate ion is oxidized quantitatively to tetrathionate ion. The amount of iodine solution produced utilize this method can then be calculated. The above method have to be repeated for both clippings. The first beat with out the ascorbic acid, but the second time with. By finding out the amount of... If you want to take on a fu ll essay, coordinate it on our website: OrderCustomPaper.com

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