Chem_215_Lect_38_Color - Freezing Point Depression and...

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1 Freezing Point Depression and Boiling Point Elevation The vapor pressure of a volatile solvent decreases upon addition of a nonvolatile solute. This leads to an increase in its boiling point Δ T b . The freezing point is lowered by Δ T f Pure water NaCl sol’n 25 o C
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2 Freezing Point Depression Recall that freezing point corresponds to the temperature at which solid is in equilibrium with the liquid: k melt k freezing Solid Liquid
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3 Freezing Point Depression and Boiling Point Elevation The vapor pressure of a volatile solvent decreases upon addition of a nonvolatile solute. This leads to an increase in its boiling point Δ T b . The freezing point is lowered by Δ T f Δ T f = - K f x m Boiling point elevation constant Molality (mol/kg) Freezing point depression constant Molality (mol/kg) Δ T b = K b x m
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4 Freezing Point Depression and Boiling Point Elevation Δ T f = - K f x m Δ T b = K b x m What mass of ethylene glycol (C 2 H 6 O 2 , molar mass = 62.1g/mol) must be added to 10.0 L of water to make an antifreeze solution
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This note was uploaded on 03/05/2009 for the course CHEM 2150 taught by Professor Chirik,p during the Fall '08 term at Cornell University (Engineering School).

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Chem_215_Lect_38_Color - Freezing Point Depression and...

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