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Colligative Properties

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The document provides an overview of solutions' colligative properties, which depend on the number of solute particles in a solution rather than their specific nature. It emphasizes how the number of particles in a solution affects its physical properties and provides practical examples to illustra...

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  • July 31, 2024
  • 4
  • 2023/2024
  • Class notes
  • Na
  • Physics
  • Secondary school
  • 1
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Solutions
Colligative Properties
Colligative property
•Is a property of solutions that depends only upon the number of solute particles, not upon
their identity.
Three important colligative properties of solutions are
1. vapor- pressure lowering
2. freezing- point depression
3. boiling- point elevation
Vapor- Pressure Lowering
• Vapor pressure is the pressure exerted by a vapor that is in dynamic equilibrium with its
liquid in a closed system.
• A solution that contains a solute that is nonvolatile (not easily vaporized) always has a
lower vapor pressure than the pure solvent.




Ionic solutes that dissociate have greater effects on vapor pressure than does a non-
dissociating solute.
•Three moles of sodium chloride dissolved in water produce 6 mol of particles because each
formula unit of NaCl dissociates into two ions.




AA

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