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Final

CHE102 Study Guide - Final Guide: Freezing-Point Depression, Boiling-Point Elevation, Colligative Properties


Department
Chemical Engineering
Course Code
CHE102
Professor
Perry Chou
Study Guide
Final

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Raoult’s law Liquid + Liquid
o Only applies to ideal solutions, where the IMF and other physical properties of the two
components are very similar, i.e Benzene and Toluene
o Relates partial pressure to vapour pressure
o For substance 1, let P1 be partial pressure, X1 be mol frac in liquid phase, Y1 be mol frac
in gas phase, ditto for substance 2
o    

o   

o   
o     
Colligative Properties (Solid + Liquid)
o Solution formed by dissolving non-volatile solute in liquid solvent (when solution is
dilute, Xsolvent>0.98)
o Vapour pressure lowering
  
Can relate to mass of solute as  

o Boiling point elevation
 

o Freezing point depression
 

o Effect of dissociation
If solute dissociates, then the # of solute particles increases, since colligative
properties depends on # of particles e take into account this using an’t Hoff i
  
% dissociation is calculated using     , where a is % dissociation, n
is the ideal I (100% dissociation) and i is what we calculated
o Osmotic pressure
  
 
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