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Project Guide: Only accessible from school account.

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Email Mr. Copenhaver if you have questions!

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Written by a student during the 2015-16 School Year.

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https://www.raci.org.au/document/item/249

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An excellent procedure for Vitamin C determination in fruit juices.

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An excellent procedure for Vitamin C determination in fruit juices.

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https://www.canterbury.ac.nz/media/documents/science-outreach/vitaminc_iodate.pdf

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Another procedure for Vitamin C determination.

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Another procedure for Vitamin C determination.

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https://www.thoughtco.com/vitamin-c-determination-by-iodine-titration-606322

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One way to determine the amount of vitamin C in food is to use a redox titration. The redox reaction is better than an acid-base titration since there are additional acids in a juice, but few of them interfere with the oxidation of ascorbic acid by iodine.

Iodine is relatively insoluble, but this can be improved by complexing the iodine with iodide to form triiodide:

Triiodide oxidizes vitamin C to form dehydroascorbic acid:

As long as vitamin C is present in the solution, the triiodide is converted to the iodide ion very quickly. However, when the all the vitamin C is oxidized, iodine and triiodide will be present, which react with starch to form a blue-black complex. The blue-black color is the endpoint of the titration.

This titration procedure is appropriate for testing the amount of vitamin C in vitamin C tablets, juices, and fresh, frozen, or packaged fruits and vegetables. The titration can be performed using just iodine solution and not iodate, but the iodate solution is more stable and gives a more accurate result.

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Use Iodine Titration to Determine the Amount of Vitamin C in Food

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One way to determine the amount of vitamin C in food is to use a redox titration. The redox reaction is better than an acid-base titration since there are additional acids in a juice, but few of them interfere with the oxidation of ascorbic acid by iodine.

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This procedure can be used to collect data for calculating heat produced from combustion.

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This procedure can be used to collect data for calculating heat produced from combustion.