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Lecture 17Spring09

Lecture 17Spring09 - CHM 115A Lecture 17 Colligative...

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1 CHM 115A Lecture 17 Colligative Properties Reading: pp. 672-686
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2 Concentration of a Solution Utility Molarity: Mass %: Molality: Mole fraction: stoichiometry calculations, analysis composition (normal saline) colligative behavior (b.p., m.p.) V.P. determination, composition
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3 Types of Solutions Solution Example Liquid in liquid Gasoline Solid in liquid Seawater Gas in liquid Liquid breathing Gas in gas Natural gas (H2S) Gas in solid H2/Pd (“cold fusion”) H2 as fuel Solid in solid Alloys
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4 Properties of Solutions Solutions have lower freezing points than pure liquids.
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5 Properties of Solutions Solutions have lower freezing points than pure liquids.
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6
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7 Colligative Properties Solutions homogeneous, mixed at the atomic/molecular scale Solubility (g of solute / mL of solvent) Affected/determined by IMF’s Phases All combinations of sol/liq/gas. (Ex. gas-liq, liq-liq solutions) Energy Considerations Energy to separate components, energy from mixing, entropy Colligative Properties Solution properties DIFFERENT than properties of the individual components. Examples: bp, fp, vp, osmotic pressure
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8 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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CPS Question #1 Solo In an aqueous solution, which substance is a non-electrolyte:
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Lecture 17Spring09 - CHM 115A Lecture 17 Colligative...

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