1 / 9

Some reactions involving iodine/iodide

Some reactions involving iodine/iodide. Oxidation of iodide. Potassium iodide solution (right) is colourless. Here we are about to oxidise the iodide using orange bromine water. The orange colour of the bromine changes to the darker brown colour of iodine, I 2.

rwinkler
Download Presentation

Some reactions involving iodine/iodide

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Some reactions involving iodine/iodide

  2. Oxidation of iodide Potassium iodide solution (right) is colourless. Here we are about to oxidise the iodide using orange bromine water.

  3. The orange colour of the bromine changes to the darker brown colour of iodine, I2.

  4. The brown colour of iodine in iodide is clearly seen in this beaker. Br2 + 2e- → 2Br- 2I- → I2 + 2e- Br2 + 2I- → 2Br- + I2 I2 + I- → I3-

  5. Reduction of iodine Iodine is a mild oxidising agent.

  6. Colourless sodium thiosulfate solution will be used to reduce iodine to iodide.

  7. As the thiosulfate solution is added, the brown colour begins to fade.

  8. Almost all the iodine (I2) has been reduced to iodide (I-).

  9. The final solution is completely colourless. I2 + 2e-→ 2I- 2S2O32- → S4O62- + 2e- I2 + 2S2O32- → 2I- + S4O62-

More Related