11Properties of SolutionsToday’s Lecture17.4 The Vapor Pressures of Solutions17.5 Boiling Point Elevation and Freezing Point Depression17.6 Osmotic Pressure17.7 Colligative Properties of Electrolyte Solutions1e.g. consider a scenario where two volatile liquids arepresent in solution (i.e. liquid-liquid solution)need a modified form of Raoult’s law for two volatileCases Involving Volatile Componentsneed a modified form of Raoult s law for two volatilecomponents:wherePTotalrepresents the total vapor pressure of a solutioncontaining A and BPTotal= PA+ PB=χAPoA+χBPoB2χAandχBare the mole fractions of A and BPoAand PoBare the vapor pressures of pure A and pure BPAand PBare the partial pressures resulting frommolecules of A and B in the vapor state above thesolution
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