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Homework Help: Chemical and phase equilibria, A12 and A21 for Infinitely dilute.

  1. Jan 9, 2013 #1
    1. The problem statement, all variables and given/known data
    (a) The activity coefficients at infinite dilution for isopropanol and water are 11.825 and 2.986 respectively at 80°C and 1 atm.
    i) Calculate the van Laar Coefficients A12 and A21

    2. Relevant equation.
    A12=lnγ (1+((x2lnγ2)/( x1lnγ1))^2)
    The eqaution for A21 is the same except 1 and 2 are reversed.

    Given the antoine eqaution for the two liquids also.

    3. The attempt at a solution
    At infinitely dilute solution, for A12 the x1 value will become 0 and for A21 the x2 value will become 0. Therefore i would be left with just A12=lnγ? but this doesn't give me the right answer.
  2. jcsd
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