FSU
CHM 1046 -
Vapor Pressure of Solutions
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12 6 Vapor Pressure of Solutions DESCRIBED BY RAOULT S LAW Psolution xsolvent P solvent Psolution vapor pressure of solution xsolvent mole fraction of solvent xsolvent nsolvent nsolvent nsolute for an ionic solute multiply n by the of dissolved ions P solvent vapor pressure of pure solvent IDEAL AND NOT IDEAL SOLUTIONS An Ideal Solution follows Raoult s Law at all concentrations of solute and solvent The solute solvent interactions are equal to the solute solute and solvent solvent interactions solute A solvent B PA xAP A PB xBP B PA PB Ptotal In a non ideal solution the solute solvent interactions are either stronger or weaker than the solute solute and solvent solvent interactions
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