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Homework Help: Colligative properties: vapor pressure with an electrolyte

  1. May 1, 2009 #1
    I'm trying to figure out how an electrolyte affects vapour pressure in a solution. My book (Chang chemistry) only lists the formulas for osmotic pressure, boiling point and freezing point. I guess Raoult's law would be something like:

    [tex]P_{1}=i X_{1} P^{1}_{o}[/tex]

    Sorry for not respecting the template, it just doesn't seem appropriate for this question.
  2. jcsd
  3. May 2, 2009 #2


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    Staff: Mentor

    In the case of electrolyte you may just assume its vapor pressure is zero, then follow the molar fraction proportional to vapor pressure path. Don't forget Van't Hoff factor.
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