CHY122S08Lecture4 - Colligative Properties Colligative...

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Unformatted text preview: Colligative Properties Colligative Properties Properties that depend on the nu#$er (not the kind) of solute particles Examples we;ll cove Examples we ll cover 1 Vapor pressure reduction 1. Vapor pressure reduction 2. Boiling point elevation 3. FreeCing point depression 4. Osmotic pressure Examples we;ll cove Examples we ll cover 1 Vapor pressure reduction 1. Vapor pressure reduction 2. Boiling point elevation 3. FreeCing point depression 4. Osmotic pressure Exceptions to the rules 1. Vapor pressure reduction 1. Vapor pressure reduction A liquid in a closed container establishes an A liquid in a closed container establishes an equilibrium with its vapor. The pressure exerted by the vapor is called The pressure exerted by the vapor is called vapor pressure. A )*lat(le substance has a vapor pressure. A n*n)*lat(le substance has no vapor pressure. 1. Vapor pressure reduction 1. Vapor pressure reduction When we add a nonvolatile solute to a When we add a nonvolatile solute to a solvent, it lowers the vapor pressure. The more solute we add the lower the vapor more solute we add, the lower the vapor pressure. This relationship is called Raoult;s law This relationship is called Raoult s law: P A O A PQ A A A A 1. Vapor pressure reduction (Practice exercise) The vapor pressure of pure water at The vapor pressure of pure water at...
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This note was uploaded on 04/13/2008 for the course CHY 122 taught by Professor Stewart during the Spring '08 term at University of Maine Orono .

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CHY122S08Lecture4 - Colligative Properties Colligative...

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