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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
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