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    Hi,
    Stuck on question 22 a (ii) on the Edexecel Chemistry June 2015 paper, I'm not really sure how to construct the equation, if someone can walk me through and explain it, it would be much appreciated

    Thanks!
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    Link-me-do.
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    there is no 22nd question in u4 and in u5, the 22nd question a)ii) is about why a solution is coloured.
    is that your question?
 
 
 
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