StudentLecture_18

StudentLecture_18 - Lecture 18 Lecture 18 Colligative...

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1 Lecture 18 10/29/2009 Lecture 18 Colligative Properties Reading for this lecture: Colligitive Properties pp. 628-642 (Section 14.4). For lecture next week: Biochemistry Interchapter, pp 497-512 ; page 473, 476 Lab next week: Preparation of Luminol, (Make your own personal lightening bug) Chapter 8 Exam average ?
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2 Properties of Solutions Solutions have lower freezing points than pure liquids.
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3 From the frozen water of the Arctic Ocean, they melt the ice. But isn’t the ocean salty? Where do explorers who walk to the North Pole get drinking water?
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4 Colligative Properties Solutions homogeneous, mixed at the atomic/molecular scale Solubility (moles of solute / L of solvent, etc) Affected/determined by IMF’s Phases All combinations of sol/liq/gas. (gas in liq, liq in liq, for example) Energy Considerations Energy to separate components, energy from mixing, disorder colligative properties solution properties DIFFERENT than properties of the individual components.
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5 Colligative Properties Properties that are affected by the number of solute particles in the solution, regardless of type. Vapor Pressure Boiling Point Freezing Point Osmotic Pressure
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6 Vapor Pressure Definition: The equilibrium pressure of a vapor above its liquid; The pressure of the vapor resulting from evaporation of a liquid above a sample of the liquid in a closed container.
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