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Raoult's Law graphs

Discussion in 'MCAT Study Question Q&A' started by unsung, Jun 16, 2008.

  1. unsung

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    Can someone explain the Raoult's Law graphs to me. I don't understand the graphs of the deviations- i.e. when the curve is below the line, when the curve is above the line.
     
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  2. Quantum Chem

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    When the vapor pressure lines of the individual substances the graph is showing negative deviation. When this occurs there is a greater interaction between the different liquids than there is with the same liquid. So in a mixture of X and Y, the X-Y interaction is greater than the X-X and Y-Y interaction.

    Positive deviation is seen when the lines are above the theoretical line. This happens when X-X or Y-Y interactions are stronger than X-Y interactions. In ideal solutions the interactions are all equal: X-X = X-Y = Y-Y.
     
  3. CommSNTS

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  4. gogopogo

    gogopogo Canadian stereotype, eh?
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    Wow do I love that site. Thanks a lot!
     
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  5. Heyeon

    Heyeon Heyeon
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    Thanks for the site. It really simplifies the concept!!
     
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  6. OP
    OP
    unsung

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