01:160:162 Lecture Notes - Lecture 3: Colligative Properties, Molality, Sodium Chloride
25 Jul 2017
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Document Summary
Ideal solutions solution in which the solvent-solute interactions are similar in magnitude to both the solute- solute interactions and the solvent-solvent interactions. A solution that obeys raoult"s law at all concentrations of solute and solvent. Consider a mixture of 2 volatile liquids (a and b) Graph of change in vp per mole fraction of a (or b) see tb. In an ideal solution, graph is increasingly linear for a. Vp of overall solution is decreasingly linear but above vp lines of a and b (see tb) In a nonideal solution, rather than linear lines, lines are curved downward or upward. Negative deviation when solute-solvent interactions are stronger than solvent-solvent plus solute-solute interactions. Positive deviation when solute-solvent interactions are weaker than solvent-solvent plus solute-solute interactions. When solute is dissolved in a solvent, fp of solvent decreases. Solution must be brought to lower temperature for it to freeze.
