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Chapter 21

Chapter 21. Colligative Properties: Vapor Pressure. Colligative Properties. Properties determined by the number of solute particles in solution rather than the type of particles . Vapor pressure lowering Boiling point elevation Freezing point depression Osmotic pressure. sugar and water.

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Chapter 21

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  1. Chapter 21 Colligative Properties: Vapor Pressure

  2. Colligative Properties • Properties determined by the number of solute particles in solution rather than the type of particles. • Vapor pressure lowering • Boiling point elevation • Freezing point depression • Osmotic pressure

  3. sugar and water salt and water What are the different properties of these solutions?

  4. sugar and water salt and water How do the colligative properties of these solutions compare?

  5. Why is salt used on the roads?

  6. Vapor Pressure Lowering

  7. How Vapor Pressure Lowering Occurs • Solute particles take up space in a solution. • Solute particles on the surface decrease the number of solvent particles on the surface. • Less solvent particles can evaporate from the surface which lowers the vapor pressure of the liquid.

  8. Raoult’s Law Vapor Pressure of solution= (mole fractionsolvent)(Vapor Pressuresolvent)

  9. Vapor Pressure Table

  10. What is the vapor pressure of an aqueous solution at 70oC if 2.00 x 102g of sucrose (C12H22O11) are dissolved in 1.00 x 102g of water. Answer: 28.2 kPa

  11. What is the vapor pressure of an aqueous solution at 70oC if 3.15 x 102g of C15H9NO4 are dissolved in 5.00 x 102g of water. Answer: 29.9 kPa

  12. What is the vapor pressure of an aqueous solution at 70oC if 3.15 x 102g of C15H9NO4 are dissolved in 5.00 x 102g of water. Answer: 29.9 kPa

  13. Homework • Worksheet: Vapor Pressure, Boiling Point and Freezing Point. (Due Tuesday or Wednesday) • Remember the “Review and Reinforcement” Worksheet. (Due Wednesday) • P and P for Lab Formula Mass from Boiling Point Elevation (Due Wednesday)

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