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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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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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