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Osmotic Pressure.

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Presentation on theme: "Osmotic Pressure."— Presentation transcript:

1 Osmotic Pressure

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

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



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


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

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

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

11 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

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

13 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


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

16 Homework P 545 67, 69, 77

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