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University of Memphis - CHEM 1120 - Chem 1120- Colligative Properties

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University of Memphis - CHEM 1120 - Chem 1120- Colligative Properties

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background image Chemistry 2: Colligative Properties: -Colligative properties of a solution depend only on the concentration of the solute 
particle, and not on the nature of the solute.
-Non-colligative properties: color, density, viscosity, toxicity, reactivity, exc. 4 colligative properties:
-Vapor pressure
-Freezing point
-Boiling point
-Osmotic pressure
Freezing/boiling point changes are directly proportional to molality. Osmotic pressure---pi=MRT
-M=molarity
-R= .08206 (L)(atm)/(mol)(K)
-T=temperature
Vapor pressure:
-Vapor pressure of solvent above a solution is less than the vapor pressure 
above the pure solvent.
-Raoult’s Law---Psolution= (Xsolvent )(P degrees)
-P degrees will be given
-find Xsolvent by taking the (moles of just the compound you are trying to 
find the vapor pressure for) and dividing by( moles of the total solution).
Boiling point:
-delta T=km
-delta T=change in temperature
-k=the boiling point(Celsius/molality)
-m=molality(mol/kg)
 --find molality by finding moles of solute first which is grams/molar mass, 
then take the number you get from that and divide by the kilograms of 
solvent.
-you are given k.
-so multiple what you are given for k by the number you got from molality 
and you get the delta T.
-but you are not done  yet….
-add/subtract (depending on if it is positive or negative) the delta T from the 
normal boiling point, which should also be given.
Freezing point:
-deltaT=km
-do same thing as boiling point

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School: University of Memphis
Department: Chemistry
Course: General Chemistry II
Professor: Brewster
Term: Spring 2016
Tags: Chemistry
Name: Chem 1120- Colligative Properties
Description: These notes will cover colligative properties which include: vapor pressure, osmotic pressure, boiling point, and freezing point. Shows how to calculate each of them. Also deals with van hoff's factor.
Uploaded: 02/03/2016
2 Pages 21 Views 16 Unlocks
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