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## properties that depend upon the solute concentration, but n

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### properties that depend upon the solute concentration, but not its identity. ... Osmosis. the pressure created by the movement of solvent. Osmotic Pressure ... – PowerPoint PPT presentation

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Title: properties that depend upon the solute concentration, but n

1
1 M NaCl
• moles NaCl in 1 L?
• moles of particles (ions) in 1 L?

one
two
2
1 M sucrose
• moles sucrose in 1 L?
• moles of particles in 1 L?

one
one
3
Colligative Property
• properties that depend upon the solute
concentration, but not its identity.

4
Colligative Properties
• vapor pressure
• boiling point
• freezing point
• Osmotic pressure

5
Vapor Pressure Reduction
• a reduction in a solvents vapor pressure from
the addition of a nonvolatile solute

6
Boiling Point Elevation ?Tb
• the boiling point of the solution minus the
boiling point of the pure solvent.
• ?Tb Kbmi

7
Problem
• What boiling point elevation occurs if 200 g.
sucrose (C12H22O11) is added to 500 g. of water?
Kb for water 0.52 C/m.

0.61 C
8
Freezing Point Depression ?Tf
• the freezing point of the pure solvent minus the
freezing point of the solution.
• ?Tf Kfmi

9
Problem
• What is the freezing point depression of 0.500 kg
ethylene glycol (C2H6O2) in 0.500 kg H2O? Kf
for water1.86C/m.

30 C
10
Osmosis
• a flow of solvent through a semipermeable
membrane from a less concentrated solution to a
more concentrated solution.

11
Osmotic Pressure
• the pressure created by the movement of solvent.

12
• The freezing point of water is -0.39C when 39 g.
of a solute are dissolved in 475 g. of water.
What is the solutes molar mass? Kf of water
1.86C /m