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Separated Solutions Semipermeable membrane- separates a sol’n and pure solvent, but only allows pure solvent to pass through
Osmosis The vol of the sol’n will increase and the solvent will decrease The flow of solvent is osmosis
Equilibrium Liquid levels eventually stop changing to equilibriumThere will be greater pressure on the sol’n b/c the liquid levels are different
Osmotic Pressure The extra pressure on the solution is the osmotic pressure Or the minimum pressure that stops osmosis = the osmotic pressure
Colligative Property? You bet! More solute, more osmotic pressure
= MRT = osmotic press in atms M = molarity R = gas law constT = temp in Kelvin
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
Electrolyte sol’ns Remember how we talked about electrolytes contribute the number of ions that they dissociate into???
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
Easy changes Our eqns are now: T = imK (freezing or boiling) = iMRT
Homework P 545 67, 69, 77
Copyright©2000 by Houghton Mifflin Company. All rights reserved. 1 Chemistry FIFTH EDITION Chapter 11 Properties of Solutions
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Copyright©2000 by Houghton Mifflin Company. All rights reserved. 1 Solutions... the components of a mixture are uniformly intermingled (the mixture is.
1 Why do we do that? we spread salt on icy roads and walkways to melt the ice we add antifreeze to car radiators to prevent the water from boiling or freezing.
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Molality and Mole Fraction Modified from: Chem%20102%20week%202.ppt Molality is a concentration unit based.
POINT > Define colligative properties POINT > Describe how solutes affect the equilibrium vapor pressure of a solution POINT > Describe boiling point.
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