Colligative Properties - PowerPoint PPT Presentation

1 / 15
About This Presentation
Title:

Colligative Properties

Description:

Colligative Properties What Are Colligative Properties? Physical Properties that depend on the number of solute particles Do NOT depend on the identity of the ... – PowerPoint PPT presentation

Number of Views:107
Avg rating:3.0/5.0
Slides: 16
Provided by: e2007189
Category:

less

Transcript and Presenter's Notes

Title: Colligative Properties


1
Colligative Properties
2
What Are Colligative Properties?
  • Physical Properties that depend on the number of
    solute particles
  • Do NOT depend on the identity of the solute
    particles

3
The Colligative Properties
  • Vapor Pressure Lowering
  • Boiling Point Elevation
  • Freezing Point Depression

4
Vapor Pressure
  • The pressure given off by liquid particles in a
    container that have escaped the liquids surface
    and turned into a gas.

5
Vapor Pressure Equilibrium
  • Particles from the liquid go into the gas state
    as they evaporate.
  • Gas particles turn into liquid again as they
    cool.
  • This happens at the same timeif it happens at
    the same rate it is in equilibrium

6
Vapor Pressure Lowering
  • When a solute is added to the solvent, the of
    solvent molecules near the surface decreases
    because the solute particles get in their way.
  • This keeps the solvent particles from turning
    into gas particles.

7
Vapor Pressure Lowering
  • Sothere are less gas particles above the
    solution exerting pressure.
  • This is lowered vapor pressure.

The Vapor Pressure of a Solution is Lower than
that of the Pure Solvent
8
Intermolecular Forces
  • High intermolecular forces means low vapor
    pressure
  • The particles are closely held onto so they cant
    be released into gas state

9
Atmospheric Pressure
  • Pressure of the air in the room over a solution

10
Boiling Point
  • Boiling is when
  • Vapor Pressure Atmospheric Pressure
  • Liquid turns into gas

11
Boiling Point Elevation
  • Adding solute lowers vapor pressure (more solute
    blocks the particles from turning into gas.so
    less pressure)
  • This makes it harder to boilso higher boiling
    point

12
Boiling Point Elevation
  • Ethylene glycol (a solute) in antifreeze allows
    cars a higher operating temperature because it
    lowers the vapor pressure of the water by raising
    the boiling point.

13
Freezing Point
  • The temperature at which the vapor pressures of
    the solid and liquid phases are the same.

14
Freezing Point Depression
  • The solute particles get in between the solvent
    particles.
  • The solute messes with the attractive forces that
    make it a solid (freezing).
  • This keeps the solution from freezing and thus
    lowering the freezing point

15
Freezing Point Depression
  • The freezing point of water is 0C, but that
    freezing point can be lowered by adding a solvent
    such as salt. This helps the ice to melt on the
    roads by lowering the temperature that the water
    will freeze to ice.
Write a Comment
User Comments (0)
About PowerShow.com