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 chit Title: decision of the vitamin C theme (ascorbic panelling) of a commercial vitamin C tablet and compare the result with the mensurate specified by the manufacturer. possibility : 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) remain be rapidly and quantitatively oxidized by integrity in acidic condition as shown in the relate equation: I2(aq) + C6H8O6 (aq) ? C6H6O6 (aq) + 2H+ (aq) + 2I- (aq) This manner involves the direct titration of the ascorbic acid with a old-hat one solution in an acidic medium. However, iodin is not very soluble in water (0.001M), this makes the method little than ideal.

Instead of dissolving solid iodine in water, we cease obtain overmuchness quantity of iodine solution by adding an unmeasured excess of potassium iodide solution to a neck volume of an acidified standard potassium iodate solution according to the sideline 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 era with out the ascorbic acid, but the second time with. By finding out the amount of... If you want to bring on a full essay, coordinate it on our website: OrderCustomPaper.com

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