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Homework Help: Non- Ideal Mixtures- positve deviation from Raoult's Law

  1. Mar 15, 2010 #1
    1. The problem statement, all variables and given/known data
    Ethanol (bp= 78° C) and water (bp= 100°C) form an azeotropic mixture at 4% water ans temperature 65°C.

    what is obtained in the residue and the distillate if:
    i) 3% water is used
    ii) 20% water is used

    3. The attempt at a solution

    I know that the distillate would always be the azeotrope but i'm not sure how the %change in water affects the residue.

    I assumed that since the azeotropic mixture is formed at 4% then the residue would be ethanol and at 20% the residue would be water.

    can someone please explain this...I know my reasoning is wrong.
  2. jcsd
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