CH302 Worksheet 2 Colligative Properties
All of this is intended to be done without the aid of a calculator. All of the calculations are designed such
that approximating should be straightforward and produce a correct result.
1. Based on the physical constants involved, which colligative property has the greatest magnitude for a
solution of a given concentration? Which can't be compared in this way? Why?
Osmotic pressure  except at extremely low temperatures  the RT term is going to be much larger
than the value of k
b
or k
f
. It is difficult to compare Raoult's Law in these terms because it uses no
physical constants.
2. Which colligative properties have a linear concentration dependence? Write their equations.
All colligative properties have a linear concentration dependence.
Osmotic pressure (
Π
= i·M·R·T)
Boiling point elevation (
Δ
T
b
= i·
m
·K
b
)
Freezing point depression (
Δ
T
f
= i·
m
·K
f
)
Vapor pressure lowering (P = P°·x)
3. Rank the following aqueous solutions in terms of increasing boiling point: 3
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 Spring '11
 Cathy
 Colligative properties, Vapor pressure

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