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Some reactions involving iodine/iodide. Potassium iodide solution (right) is colourless. Here we are about to oxidise the iodide using orange bromine.

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Presentation on theme: "Some reactions involving iodine/iodide. Potassium iodide solution (right) is colourless. Here we are about to oxidise the iodide using orange bromine."— Presentation transcript:

1 Some reactions involving iodine/iodide

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

3 The orange colour of the bromine changes to the darker brown colour of iodine, I 2.

4 The brown colour of iodine in iodide is clearly seen in this beaker. Br 2 + 2e - → 2Br - 2I - → I 2 + 2e - Br 2 + 2I - → 2Br - + I 2 I 2 + I - → I 3 -

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 (I 2 ) has been reduced to iodide (I - ).

9 The final solution is completely colourless. I 2 + 2e - → 2I - 2S 2 O 3 2- → S 4 O e - I 2 + 2S 2 O 3 2- → 2I - + S 4 O 6 2-


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