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 solutionxsolvent= mole fraction of solventxsolvent= nsolvent / [nsolvent + nsolute]*for an ionic solute, multiply n by the # of dissolved ionsP°solvent= vapor pressure of pure solventIDEAL 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°APB=xBP°BPA + PB=PtotalIn a non-ideal solution, the solute-solvent interactions are either stronger or weaker than the solute-solute and solvent-solvent
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