solutions_ii_colligative_properties.ppt - Colligative Properties of Solutions Chemistry How do you get from this to this Add an ionic compound

solutions_ii_colligative_properties.ppt - Colligative...

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Colligative Properties of Solutions Chemistry
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How do you get from this…
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…to this?
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Add an ionic compound!
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Colligative Properties Properties that depend only on the number of solute particles and not on their identity.
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Some Colligative Properties are: Vapor pressure lowering Boiling point elevation Freezing Point depression Osmosis
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Vapor Pressure
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Vapor Pressure Lowering The particles of solute are surrounded by and attracted to particles of solvent. Now the solvent particles have less kinetic energy and tend less to escape into the space above the liquid. So the vapor pressure is less.
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Ionic vs Molecular Solutes Ionic solutes produce two or more ion particles in solution. They affect the colligative properties proportionately more than molecular solutes (that do not ionize). The effect is proportional to the number of particles of the solute in the solution.
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How many particles do each of the following give upon solvation?
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  • Fall '16
  • Mr. grady
  • Solubility, Vapor pressure, Freezing-point depression

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