Lecture_31 - Todays Lecture Properties of Solutions 17.4...

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1 1 Properties of Solutions Today’s Lecture 17.4 The Vapor Pressures of Solutions 17.5 Boiling Point Elevation and Freezing Point Depression 17.6 Osmotic Pressure 17.7 Colligative Properties of Electrolyte Solutions 1 ± e.g. consider a scenario where two volatile liquids are present in solution (i.e. liquid-liquid solution) ± need a modified form of Raoult’s law fo two volatile Cases Involving Volatile Components need a modified form of Raoult s law for two volatile components: ± where ± P Total represents the total vapor pressure of a solution containing A and B P Total =P A +P B = χ A P o A + χ B P o B 2 ± χ A and χ B are the mole fractions of A and B ± P o A and P o B arethevaporpressuresofpureAandpureB ± P A and P B are the partial pressures resulting from molecules of A and B in the vapor state above the solution
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2 2 ± liquid-liquid solutions obeying the modified form of Raoult’s law (see previous slide) are said to be ideal ± e.g. benzene-toluene solution; expect Δ H soln to be close Nonideal Volatile Solutions to zero (i.e. solution closelyobeys Raoult’s law - ideal behavior) ± again, ideal behavior is never exactly achieved; deviations (positive or negative) are often observed ± consider a scenario where the solute has a strong ttr cti nfr thesl ven t (str n liquid liquid ttr cti n 3 attraction for the solvent (strong liquid-liquid attraction) ± e.g. acetone-water solution; expect Δ H soln to be exothermic and large
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Lecture_31 - Todays Lecture Properties of Solutions 17.4...

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