CHM LECTURE NOTESCH 12.6Vapor Pressure of Solutions-Described by Raoult’s Law: Psol = (Xsolvent)(Psolvent) -Distinguish between molecular solutes and ionic solutes- For an ionic solute: Psolution =(Xsolvent)(Psolvent)- Xsolvent = n solvent/ n solvent + n solute-Multiply n solute by # of dissolved ions- Do example 12.6 in book for extra practiceIdeal 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 (if the solute has h-bonds within itself and the solvent h-bonds and they for h-bonds together, they form an ideal solution)- A non-ideal solution= the solute-solvent interactions are either stronger or weaker than the solute-solute and solvent-solvent interactionsFor an ideal solution: solute (A) + solvent (B)PA=XAPOAPB=XBPOBPtotal of solution=
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