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Homework Help: Solvent Extraction question at different pH levels

  1. Nov 28, 2017 #1
    The question I have been given:
    Draw the dominant forms of each of the compounds below and state which, if any, would be expected to extract from aqueous solution into hexane at (a) pH 12 and (b) pH 2. CH3CH2COOH CH3CH2NH2 CH3CH2CH2OH H2NCH2CH2COOH
    From my understanding, I can tell what the dominant form is by comparing the pKa of each compound to the pH; if the pH is lower, the specie is protonated. If it is higher, the specie is deprotonated. I am confused on how to tell whether it will extract into hexane? Is it based on whether the specie is charged or not (a neutral specie is the only one that will extract into hexane)?
  2. jcsd
  3. Nov 29, 2017 #2


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