Iodometric Titration Animation

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Principles of Iodometric Titration

Iodometric titration is a type of redox titration where iodine serves as an oxidizing agent. It is commonly used in analytical chemistry to determine the concentration of reducing agents like Vitamin C (ascorbic acid).

The titration proceeds as follows:

1. Iodine solution is gradually added to a sample containing Vitamin C.
2. Vitamin C reacts with iodine, causing the iodine to be reduced to iodide ions.
3. When all Vitamin C has been oxidized, additional iodine will remain in solution.
4. The starch indicator, which does not react with Vitamin C, forms a blue complex with excess iodine.
5. The appearance of the blue color marks the endpoint of the titration.

Chemical reaction between iodine and Vitamin C:

I₂ + C₆H₈O₆ → 2I^- + C₆H₆O₆ + 2H⁺

This titration method is valuable for determining Vitamin C content in foods, beverages, and pharmaceutical products.