What colour does chlorine go in a solution of potassium iodide?
Its 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 Before attempting any practical work based on the advice and suggestions on this website, you must do the following. Identify any hazards, assess the risks from these hazards, and then decide appropriate control measures to reduce the risks. You must have these approved by those in authority in your school or college laboratory. Do not rely on what is said on this website. For further guidance see our tutorial on Risk Assessment.
