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Does the total number of carbons in an ester affect its Kc of hydrolysis?

  1. Aug 7, 2010 #1

    I am currently writing a research paper. I performed an experiment whereby I left 5 esters of different overall number of carbons (methyl benzoate, ethyl acetate, ethyl formate being 3 examples) in presence of water and concentrated HCl to reach equilibrium (in 9 days). I then titrated the solution against NaOH and did subsequent calculations to derive the equilibrium constant (Kc) values of each ester. What I found was rather interesting: the more carbons an ester has, the lower the Kc value, though not proportionally so. The experiment was done under standard conditions.

    My question is, is there any particular reason or justification as to why this is so? Or was this rather just a fluke?

    I appreciate any ideas of suggestions you have. Thank you!
  2. jcsd
  3. Aug 8, 2010 #2


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    Staff: Mentor

    Are you sure you have measured Kc, and not reaction kinetics?

    It is not to say that your observation is wrong.
    Last edited by a moderator: Aug 13, 2013
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