exp 12 - In part 1 of this experiment sample of ascorbic...

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In part 1 of this experiment sample of ascorbic acid was oxidized by iodine to experimentally calculate the mass of ascorbic acid. This was done by titrating a solution of ascorbic acid, KI, HCl, and starch with KlO 3 until it turned blue. The iodate ion reacted with iodide and hydrogen to produce iodine and water. IO 3 - + 5 I- + 6 H+ -> 3 I 2 + 3 H 2 O. Then the excess I 2 reacted with I- to produce I 3 -, signaling a blue end-point. I 2 + I- -> I 3 -. The initial masses of the two samples of ascorbic acid were .406g and .404g. The amount of KlO 3 added to each solution was 7.1mL and 7.9mL respectively. Using the amounts of KlO 3 added, the moles of KlO 3 and C6H8O6 were determined and then the experimental masses of ascorbic acid were calculated. This came out to be .400g and .446g respectively. The first calculated mass was very close to the actual mass while the second mass was a bit off. This may have been due to adding too much KlO 3 . In part 2 of this experiment the effect of temperature on ascorbic acid was tested.
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exp 12 - In part 1 of this experiment sample of ascorbic...

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