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chem discussion lab 12

chem discussion lab 12 - And from the moles of KIO 3 used...

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Yedda Bruckart Lab Partner: Bridget Due: February 4, 2008 Thursday, 1pm Section Experiment #12 TA: Erin Brocker Discussion: In part one of the experiment our goal was to determine the experimental mass of ascorbic acid, calculated from the moles of ascorbic acid. In order to do this we titrated ascorbic acid with KIO 3. We titrated until the solution turned blue and this gave us the moles of KIO 3 necessary for equilibrium to be reached. The moles of KIO 3 was .0086mol and from this we determined that the moles of ascorbic acid used was .00258 moles, this gave us a ending result of .454g Ascorbic acid. However, our initial mass of Ascorbic acid was .4 g and therefore an error occurred. We may have added too much starch solution to the reaction. The net chemical equation for this reaction is: IO 3 - + 5I - +6H + 3I 2 + 3H 2 O In part two of the experiment, we determined the effect of temperature on Ascorbic acid by titrating boiled Ascorbic acid with KIO 3 until the solution turned blue.
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Unformatted text preview: And, from the moles of KIO 3 used we could determine the experimental mass of Ascorbic acid again. The moles of KIO 3 used were .0021 moles for both trials, and that gave us an experimental mass of .3696 grams of Ascorbic acid. Our initial mass of Ascorbic Acid was .4 grams and therefore determined that cooking foods that contain Vitamin C does not make a great effect on the antioxidant Vitamin C. The net chemical equation was: C 6 H 8 O 6 + I 2 2I-+ 2H + In part three of the experiment we analyzed Vitamin C tablets to obtain the experimental mass of Ascorbic Acid calculated from the moles of KIO 3 titrated with crushed Ascorbic Acid and in trial two also including KI and HCl. We also determined the percent mass of Ascorbic Acid in each tablet for both trials. The masses were: .55968 g and .5016 g; the percent mass of Ascorbic Acid in each tablet was 90% and 81% respectively. The net chemical equation was: I 2 + I- I 3-...
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