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 stamp pad 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 sample, 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 utilise mainly for the determination of strong reducing agents, ascorbic acid C6H8O6 (aq) exert be rapidly and quantitatively oxidized by mavin in acidic condition as shown in the fill equation: I2(aq) + C6H8O6 (aq) ? C6H6O6 (aq) + 2H+ (aq) + 2I- (aq) This manner involves the direct titration of the ascorbic acid with a criterion one solution in an acidic medium. However, one is non very soluble in water (0.001M), this makes the method little than ideal.

Instead of dissolving solid iodine in water, we piece of ass obtain profusion quantity of iodine solution by adding an unmeasured excess of potassium iodide solution to a fare volume of an acidified standard potassium iodate solution according to the spare- beat activity 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 quant itatively to tetrathionate ion. The amount ! of iodine solution produced utilize this method can then be calculated. The above method have to be repeated for cardinal clippings. The first time with out the ascorbic acid, but the second time with. By finding out the amount of... If you want to line up a full essay, coordinate it on our website: OrderCustomPaper.com

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