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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 equilibrium There 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 const T = 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 30 o C. 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 , 69, 77
Copyright©2000 by Houghton Mifflin Company. All rights reserved. 1 Chemistry FIFTH EDITION Chapter 11 Properties of Solutions
Chapter 11 Properties of Solutions. Copyright © Cengage Learning. All rights reserved 2 Solution – a homogeneous mixture. Solute – substance being dissolved.
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Change in Freezing Point Common Applications of Freezing Point Depression Propylene glycol Ethylene glycol – deadly to small animals.
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1 Colligative Properties of Solutions Colligative properties are properties that depend only on the number of solute particles in solution and not on the.
Osmosis and Colloids. Osmotic Pressure Another colligative property A solution and a pure solvent are separated by a semipermeable membrane - membrane.
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.
Colligative Properties –Vapor Pressure Lowering –Boiling Point Elevation –Freezing Point Depression –Osmosis and Osmotic Pressure.
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Colligative Properties. How does the solute change the properties of the solvent? Consider aqueous solutions. Solvent = water. How do the properties of.
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Chapter 141 Solutions and Their Behavior Chapter 14.
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.
Which of the following concentration measures will change in value as the temperature of a solution changes? a) Mass percent b) Mole fraction c) Molality.
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Colligative Properties. _______________ – physical properties of solutions that are affected only by the number of particles NOT the identity of the solute.
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1. 2 Colligative Properties 3 The properties of solvent that depend ONLY on the amount of solute added to it NOT depend on the identity of solute.
Solutions (Chapter 12) The Solution Process Why do things dissolve? -- driving force toward more random state (entropy) -- attractive forces between solute.
Chapter 11 Properties of solutions. Solutions A solution is a homogenous mixture. The solvent does the dissolving. The solute is dissolved by the solvent.
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Solutions Dr. Muon Hazlett Mandeville High School.
Electrolytes. Ionic compounds Break down into positive and negative ions Conduct electricity Essential to us !!!
Updates Midterms are Feb. 08 and Mar. 15 at 7pm… anyone with a night class or other midterm will write it at 6 pm (notify me at least 1 week prior if you.
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