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    Displacement reactions can be used to detect bromide ions in solution.
    A student has a solution that contains bromide ions. The student carries out the following
    experiment.
    Step 1
    • She bubbles some chlorine gas through a sample of the solution.
    • The mixture changes colour.
    Step 2
    • The student then adds an organic solvent, cyclohexane, to the mixture.
    • She shakes the contents and allows the layers to separate.
    (i) Write the ionic equation for the reaction that takes place in step 1.

    The answer is Cl2 + 2Br- → Br2 + 2Cl–

    can someone explain to me how the equation came to this answer .
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    Cl2 comes from step 1 where it says chlorine gas. 2Br- comes from the paragraph at the top where it says bromide ions, it is 2 bromide ions because you need to balance the equation. Br2 comes from looking in the databooklet that Br is higher up in the Electrochemical series so it is oxidised. 2Cl- comes from the reduction equation of Cl.
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    (Original post by A_Ch)
    Cl2 comes from step 1 where it says chlorine gas. 2Br- comes from the paragraph at the top where it says bromide ions, it is 2 bromide ions because you need to balance the equation. Br2 comes from looking in the databooklet that Br is higher up in the Electrochemical series so it is oxidised. 2Cl- comes from the reduction equation of Cl.
    thank you so much !!
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    welcome. I wasn't sure if I explained that good enough.
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