Colligative properties 1.23.12

Colligative properties 1.23.12 - If the freezing point of...

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Susie Lee Colligative Properties SI sessions [email protected] Sun 7-8p HECC 202 1/23/12 Mon 7-8p HECC 202 Wed 7-8p HECC 202 1. What are colligative properties based on? What are the four types? 2. What is vapor pressure ? What formulas are associated with it? 3. What is boiling point elevation ? What formulas are associated with it? 4. What is freezing point depression ? What formulas are associated with it? 5. What is osmotic pressure ? What formulas are associated with it? PRACTICE PROBLEMS: 1.) If one dissolves 15.0g of sucrose, C 12 H 22 O 11 , in a cup of water (225g). What is freezing point of the solution? K fp = -1.86 o C/m 2.) Some ethylene glycol, HOCH 2 CH 2 OH, is added to your car’s cooling system along with 5.0kg of water.
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Unformatted text preview: If the freezing point of the water-glycol solution is -15.0 o C, what was the mass of ethylene glycol must have been added? 3.) Find the osmotic pressure of a naphthalene (C 10 H 8 ) in benzene solution at 15˚C if the solution contains 14g of naphthalene per liter of solution. Susie Lee Colligative Properties SI sessions [email protected] Sun 7-8p HECC 202 1/23/12 Mon 7-8p HECC 202 Wed 7-8p HECC 202 4.) An aqueous solution containing 1.00g of bovine insulin per liter has an osmotic pressure of 3.1 mmHg at 25 o C. Calculate the molar mass of bovine insulin. R=.08206 L atm/mol K 5.) Calculate molarity if solution in water (300K) has osmotic pressure of 3.00 atm....
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