A 50.0 mL sample of asorbic acid solution was titrated to until the first sign o

Question

A 50.0 mL sample of asorbic acid solution was titrated to until the first sign of permanent blue/purple colour with 7.706 mM potassium iodate. The titration volumes are shown below. Calculate # of moles of asorbic acid in the 50.0 mL sample:

Titration Volumes of KIO3

Trial 1:

Volume intial buret reading / mL: 12.54

Volume final buret reading / mL: 38.74

Volume of KIO3 used / mL: 26.20

Trial 2:

Volume intial buret reading / mL: 8.78

Volume final buret reading / mL: 34.93

Volume of KIO3 used / mL: 26.15

Explanation / Answer

When iodate ions (IO3-) are added to an acidic solution containing iodide ions (I-), an oxidation-reduction reaction occurs;

- the iodate ions are reduced to form iodine

IO3- + 6 H+ + 5 e- -->

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