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 lozenge Title: use of the vitamin C theme (ascorbic panelling) of a commercial vitamin C tablet and compare the result with the mensurate specified by the manufacturer. scheme : In this investigate, 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 employ mainly for the determination of strong reducing agents, ascorbic acid C6H8O6 (aq) prolong be rapidly and quantitatively oxidized by iodin in acidic condition as shown in the gratify equation: I2(aq) + C6H8O6 (aq) ? C6H6O6 (aq) + 2H+ (aq) + 2I- (aq) This manner involves the direct titration of the ascorbic acid with a meter one solution in an acidic medium. However, single is not very soluble in water (0.001M), this makes the method less(pre nominal) than ideal.

Instead of dissolving solid iodine in water, we behind obtain tautological quantity of iodine solution by adding an unmeasured excess of potassium iodide solution to a furbish up laid volume of an acidified standard potassium iodate solution according to the undermentioned 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 ii clippings. The first clock time with out the ascorbic acid, but the second time with. By finding out the amount of... If you want to get a full essay, coordinate it on our website: OrderCustomPaper.com

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