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P&D lab esterification.

  1. Mar 16, 2008 #1

    rock.freak667

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    1. The problem statement, all variables and given/known data
    Some students had a disagreement about the esterification reaction between ethanol and ethanoic acid. Student A feels that the -OH group from the acid combines with the H from the alcohol functional group.
    Suggest a hypothesis for his feeling and design a lab to test the hypothesis.

    2. Relevant equations

    [tex]C_2H_5OH + CH_3COOH \rightarrow CH_3COOC_2H_5 + H_2O[/tex]

    3. The attempt at a solution

    Ok, well my idea would be to somehow label the oxygen on either the acid or the alcohol. I chose O-18. But I am not sure what steps are taken to actually label the oxygen like that.
    Then react the two, extract the ester formed, and run it through a mass spectrometer. But when the ester is formed, it is formed in a layer with water,how do I separate the two? (Simple pipette and extract until it looks like all has been pipetted?)
     
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  3. Mar 17, 2008 #2

    chemisttree

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    You can buy O-18 labelled water. Any help?

    If you injected it into a GC-MS you wouldn't have to separate anything...
     
  4. Mar 17, 2008 #3

    rock.freak667

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    Ah well all I need to say is that I labelled the oxygen. So no need to elaborate on it.
    But apparently I must use the normal mass spec. I know so I would need to extract it somehow. I'm thinking steam distillation.
     
  5. Mar 18, 2008 #4

    chemisttree

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    Not a good idea in the presence of either an acid or base. Maybe diluting in solvent and drying with Na2SO4 after washing with bicarb.
     
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