1
1
Properties of Solutions
Today’s Lecture
17.4 The Vapor Pressures of Solutions
17.5 Boiling Point Elevation and Freezing Point Depression
17.6 Osmotic Pressure
17.7 Colligative Properties of Electrolyte Solutions
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e.g. consider a scenario where two volatile liquids are
present in solution (i.e. liquid-liquid solution)
need a modified form of Raoult’s law for two volatile
Cases Involving Volatile Components
need a modified form of Raoult s law for two volatile
components:
where
P
Total
represents the total vapor pressure of a solution
containing A and B
P
Total
= P
A
+ P
B
=
χ
A
P
o
A
+
χ
B
P
o
B
2
χ
A
and
χ
B
are the mole fractions of A and B
P
o
A
and P
o
B
are the vapor pressures of pure A and pure B
P
A
and P
B
are the partial pressures resulting from
molecules of A and B in the vapor state above the
solution

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