Group 7: Halogens
Read our general notes on Risk Assessment
What colour does chlorine go in a solution of potassium iodide?
It’s not a question of the chlorine changing colour. The very pale colour of chlorine disappears as colourless chloride ions form. All this is masked by the formation of iodine which is much more strongly coloured.
Chlorine oxidises the iodide ions to iodine which, in the continued presence of excess iodide ions, appears reddish brown due to the presence of aqueous triiodide ions. Ulex
Risk assessment
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updated: 27 August 2003
