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Halogen displacement

Which halogen pushes out which? Cl₂, Br₂ and I₂.

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What you do

1. Add chlorine water to tube 1 (KBr).
2. Add chlorine water to tube 2 (KI).
3. Add bromine water to tube 3 (KI).
4. Add bromine water to tube 4 (KCl). Does anything happen?
5. Bonus: add starch to tube 2 to confirm the iodine.

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