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Osmotic Pressure

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

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

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

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** = MRT = osmotic press in atms M = molarity R = gas law const**

T = temp in Kelvin

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

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

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

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Homework P 545 67, 69, 77

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