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Homework Help: Rate of reaction

  1. Oct 18, 2011 #1
    1. The problem statement, all variables and given/known data
    http://www.mrev.org.uk/A-Level_Site/New%20A-Level%20Unit%204/Rates.html [Broken]
    (the answers are at the top - see link)

    Could someone please help me with the question (about half way through) on ethyl ethanoate and sodium hydroxide.
    in cii) we identified the half life doubles
    ciii) we identified the order is second order

    for part civ) we are asked is this the order for OH- ions or total order.
    I would have said OH- order BUT the answer is total order.
    Please could someone explain this (the mark schemes explanation is ester and NaOH are equimolar at the start - how is this relevant)


    2. Relevant equations

    3. The attempt at a solution
    I have shown my attempts above in the body of this question
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Oct 19, 2011 #2
    questions like this come up often and I am worried it may come up in mine so i would really like to understand the theory behind it
  4. Oct 19, 2011 #3
    i read a few books and they all agree the graph should only show order with respect to OH ions
    why is this not the case here
  5. Oct 19, 2011 #4
    It might be better if you present the relevant information here. I couldn't find what you're talking about!
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