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Colligative Properties

Colligative Properties Motto : Getting in the way is Good, Creating Disorder is Better. Colligative Properties. EXAM #2 REVIEW SESSION Date: Saturday, March 20 th Time: 1:00PM - 2:30PM Place: Here (Liquid N 2 ice cream with self-assembling syrup “caviar” will be served).

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Colligative Properties

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  1. Colligative Properties Motto:Getting in the way is Good,Creating Disorder is Better Colligative Properties EXAM #2 REVIEW SESSION Date: Saturday, March 20th Time: 1:00PM - 2:30PM Place: Here (Liquid N2 ice cream with self-assembling syrup “caviar” will be served)

  2. Hydrochloric acid is sold as a concentrated aqueous solution. If the molarity of commercial HCl is 12.0 and its density is 1.18g/cm3, calculate the following: • The molality of the solution  • The weight percent of HCl in the solution Using Concentration Units

  3. Colligative Properties • What happens to the solvent when a solute is dissolved? • Colligative properties= Properties of the solvent that change upon dissolution • Vapor pressure lowering • Freezing point depression • Boiling point elevation • Osmotic pressure

  4. Colligative PropertiesRaoult’s Law- Vapor Pressure Lowering • Example: • The vapor pressure of water at 20 oC is 20.1 mm Hg. What is the pressure of 100 g water mixed with 100g ethylene glycol, C2H2(OH)2?

  5. Colligative Properties- Vapor Pressure Lowering • Distillation: Changing the composition of a mixture of volatile liquids • Vapor Pressures at 50 oC • Water=99 mmHg • Ethanol =232 mmHg • Distill a 10% alcohol solution.

  6. Boiling Point Elevation

  7. Freezing Point Depression

  8. Effect of Ionic Compounds • Which of the following has the greatest degree of freezing point depression? • 0.1m sugar • 0.1m NaCl • 0.08 m CaCl2 • 0.04 m Na2SO4 • Which has the smallest amount of freezing point depression?

  9. Which is better at melting ice, per gram, NaCl or CaCl2? • NaCl • CaCl2

  10. Osmotic Pressure • =cRT = osmotic pressure in atm c= concentration in mol/L R= 0.0821Latm/Kmol T= temperature in Kelvin • 12.5g of a cellulose derivative was dissolved in 1L of water. The osmotic pressure of this solution was 0.00210 atm at 30°C. What is the molar mass of this molecule?

  11. Osmotic Pressure and Edema

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