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    I need this to be cleared before my exam next week, i know that if I- is displaced the cyclohexane layer is pink, when Bromine is displaced Orange, but when there is no reaction, what colour is the solution and cyclohexane layer? Is it the colour of Br2 or Cl-? And the water layer is the same right? Texts books don't say colours just says no reaction. Thank you
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    (Original post by raiden95)
    I need this to be cleared before my exam next week, i know that if I- is displaced the cyclohexane layer is pink, when Bromine is displaced Orange, but when there is no reaction, what colour is the solution and cyclohexane layer? Is it the colour of Br2 or Cl-? And the water layer is the same right? Texts books don't say colours just says no reaction. Thank you
    I hope my answer bellow helps.



    • when ioDIDE ions are displaced by a more powerfull oxidising agent e.g. Cl2 or Br2 the cyclohexane solution turns purple. This is because the following is happening:

      Cl2 + 2I- --> 2Cl- + I2
      This iodine causes the cyclohexane to turn purple


    • I think for the second part of your question your trying to say if for example you added Iodine to a solution of broMIDE ions no reaction will take place. This is correct, in this case if cyclohexane was added to this solution it will remain purple because of the following:

      I2 + 2Br- --> I2 + 2Br-
      The precence of iodine causes the cyclohexane to remain purple

      ( this equation is just to illustrate the fact that there are iodine molecules in the solution)
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    If there is no reaction it is because the one added to the (-) ion is less reactive
    So...
    2Br(-) + Cl2 ---> Br2 + Cl2
    Br2 + 2Cl(-) ---> Br2 + Cl2
 
 
 
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