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 pad of paper Title: finale of the vitamin C theme (ascorbic panelling) of a commercial vitamin C tablet and compare the result with the mensurate specified by the manufacturer. supposition : In this prove, 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) bear upon be rapidly and quantitatively oxidized by single in acidic condition as shown in the by-line equation: I2(aq) + C6H8O6 (aq) ? C6H6O6 (aq) + 2H+ (aq) + 2I- (aq) This manner involves the direct titration of the ascorbic acid with a amount one solution in an acidic medium. However, iodine is non very soluble in water (0.001M), this makes the met hod less(prenominal) than ideal.

Instead of dissolving solid iodine in water, we move obtain pointless quantity of iodine solution by adding an unmeasured excess of potassium iodide solution to a have a go at it volume of an acidified standard potassium iodate solution according to the future(a) 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 sol ution produced utilize this method can then! be calculated. The above method have to be repeated for both clippings. The first clock with out the ascorbic acid, but the second time with. By finding out the amount of... If you want to gear up a full essay, coordinate it on our website: OrderEssay.net

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