C400Ch11LN3 - Colligative Properties What are Colligative...

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Colligative Properties What are Colligative Properties? Properties which depend on the concentration of the solute The identity of the solute is not really important Vapor Pressure Lowering A nonvolatile solute is added to a solvent. The vapor pressure of the solvent lowers! The more solute is added, the lower the solvent vapor pressure. This is Raoult’s Law: P = X solv P 0 P 0 is the vapor pressure of pure solvent P is the vapor pressure of the solvent above the solution What about ionic compounds? How many particles does NaCl form when it dissolves? How many does Ca 3 (PO 4 ) 2 form? This means that the X solv is lower, so the vapor pressure lowers even more! This is adjusted with a dissociation factor, i is the van’t Hoff factor It is: Phase Diagram What else happens when the vapor pressure lowers? You can see the whole picture on a phase diagram.
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For a solution, the vapor pressure curve is lowered. This means that the boiling point of a solution is higher than the boiling point of
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This note was uploaded on 06/25/2008 for the course CHEM 400-401 taught by Professor Dr.samples during the Fall '06 term at American River.

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C400Ch11LN3 - Colligative Properties What are Colligative...

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