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18-soln_props - Ch 17 Properties of Solutions C o llig a...

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1 Week 7 CHEM 1310 - Sections L and M 1 Ch 17: Properties of Solutions Colligative Properties Difference between dilute solution and pure solvent depends on the amount of solute present not its identity The Vapor Pressures of Solutions Boiling Point Elevation and Freezing Point Depression Practice Problems Week 7 CHEM 1310 - Sections L and M 2 Raoult’s Law Substances have lower vapor pressures in solution than in pure form P solution = X solvent solvent Δ P = P° solvent - P solution X solvent = 1 - X solute P solution = (1-X solute ) P° solvent P solution = P° solvent - X solute solvent Δ P = P° solvent - P solution = X solute solvent Week 7 CHEM 1310 - Sections L and M 3 Deviations from Ideal Vapor P Positive deviation = solute-solvent attractions < solvent-solvent attractions
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2 Week 7 CHEM 1310 - Sections L and M 4 Deviations from Ideal Vapor P Negative deviation = solute-solvent attractions > solvent-solvent attractions Week 7 CHEM 1310 - Sections L and M 5 Practice Problem CCl 4
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