Lecture 18

Lecture 18 - 1 1 CHM 115 Lecture 18 Today’s Lecture...

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Unformatted text preview: 1 1 CHM 115 Lecture 18 Today’s Lecture Reading was KTT: Review Sections: 14.4 Colligative Properties Vapor pressure lowering Boiling point elevation Freezing point depression Osmotic pressure Next Lecture Read Pages: 497 thru 512 2 Colligative Properties • Solutions homogeneous, mixed at the atomic/molecular scale • Solubility (g of solute / mL of solvent) Affected/determined by IMF’s • Phases All combinations of sol/liq/gas. (Ex. gas-liq, liq-liq solutions) • Energy Considerations Energy to separate components, energy from mixing, entropy • Colligative Properties Solution properties DIFFERENT than properties of the individual components. Examples: bp, fp, vp, osmotic pressure 3 Colligative Properties Properties that are affected by the number of solute particles in the solution, regardless of type. Vapor Pressure Boiling Point Freezing Point Osmotic Pressure 4 iClicker- #1 In an aqueous solution, which substance is a non-electrolyte: A. Hydrogen chloride (HCl) B. Potassium nitrate (KNO 3 ) C. Ethylene glycol (C 2 H 6 O 2 ) D. Ammonia (NH 3 ) 5 Vapor Pressure Definition : The equilibrium pressure of a vapor above its liquid....
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This note was uploaded on 12/13/2011 for the course CHEM 115 taught by Professor L during the Fall '02 term at Purdue.

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Lecture 18 - 1 1 CHM 115 Lecture 18 Today’s Lecture...

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