Solid-Liquid Equilibrium in a Binary System

Solid-Liquid Equilibrium in a Binary System - Solid-Liquid...

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Unformatted text preview: Solid-Liquid Equilibrium in a Binary System Biphenyl and Naphthalene Tof,B Tof,N T’ XN = 1.0 XB = 0.0 XN = 0.0 XB = 1.0 XN = XN’ XB = 1.0 - XN’ Melting Point Curves Cooling Curves for Solvent A Contaminated by Solute B 1 2 3 4 5 6 7 8 9 10 2 4 6 8 10 12 Cooling curve for Pure Solvent Time (minutes) 2 4 6 8 10 12 2 4 6 8 10 12 Cooling Curve for Impure Solvent Time (minutes) 2 4 6 8 10 12 2 4 6 8 10 12 Cooling Curve for Eutectic Time (minutes) Temperature Tof,A= 18 oC XA =1.0 T’ T1 Tof,A T1=15 oC XA < 1.0 T’ = 13 oC XA = XA’ Practical consequences of freezing point lowering • Melting ice of roadways (water and salt) • Preventing coolant from freezing in engine block (water and ethylene glycol) • Preventing living cells from freezing (water and glucose) in spring peeper frogs • Measurement of molecular masses • Purity analysis in organic labs Experimental Phase Diagram Tof,A Tof,B Slope = RT2/ΔHfus,A A T’ XA’ Slope = −RT2/ΔHfus,B Chemical potential as a guide to...
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This note was uploaded on 11/07/2011 for the course CHEM 356 taught by Professor Rowell during the Summer '10 term at Drexel.

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Solid-Liquid Equilibrium in a Binary System - Solid-Liquid...

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