CHM 111 Chapter Notes - Chapter 17: Kilogram, Ideal Solution, Molality
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CHM 111 Full Course Notes
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Factors affecting solubility: structure effects, solubility is favored if the solute and solvent have similar polarities. In such cases the observed vapor pressure will be lower than the value predicted by raoult"s law; there is a negative deviation from raoult"s law: for liquid-liquid solutions where both components are volatile, Ptotal is the total vapor pressure of a solution containing a and b, xa and. In this case, molecules have a higer tendency to escape, and positive deviations are observed: for a solution of very similar solutions, the enthalpy is very close to zero. T is the boiling-point elevation (the difference between the boiling point of the solution and that of the pure solvent) Kb is a constant that is characteristic of the solvent and is called the molal boiling- point elevation constant. Because liquid levels are different, there is a greater hydrostatic pressure on the solution than the pure solvent.