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Separated Solutions Semipermeable membrane- separates a sol’n and pure solvent, but only allows pure solvent to pass through.

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Presentation on theme: "Separated Solutions Semipermeable membrane- separates a sol’n and pure solvent, but only allows pure solvent to pass through."— Presentation transcript:

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3 Separated Solutions Semipermeable membrane- separates a sol’n and pure solvent, but only allows pure solvent to pass through

4 Osmosis The vol of the sol’n will increase and the solvent will decrease The flow of solvent is osmosis

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7 Equilibrium Liquid levels eventually stop changing to equilibrium There will be greater pressure on the sol’n b/c the liquid levels are different

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9 Osmotic Pressure The extra pressure on the solution is the osmotic pressure Or the minimum pressure that stops osmosis = the osmotic pressure

10 Colligative Property? You bet! More solute, more osmotic pressure

11  = MRT  = osmotic press in atms M = molarity R = gas law const T = temp in Kelvin

12 A problem The osmotic pressure of a sol’n containing 26.5 mg of aspartame per L is 1.70 torr at 30 o C. Calculate the molar mass of aspartame

13 Electrolyte sol’ns Remember how we talked about electrolytes contribute the number of ions that they dissociate into???

14 van’t Hoff factor i Not every single molecule dissociates, so i is the value for the actual dissociation It will be given to you

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16 Easy changes Our eqns are now:  T = imK (freezing or boiling)  = iMRT

17 Homework P , 69, 77


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