Lecture_17 - Lecture 17, 11/22/07 Solutions Reading:...

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Lecture 17, 11/22/07 Solutions Reading: Sections 9.8 (part), pp. 408-412; Section 13.2-13.4, pp. 591-606; Section 5.8, pp. 205-212; Section14.1-14.2, pp. 658-668 Lab: Where’s the iron?
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Formation of Solutions Ethanol with water. Ethanol: Shake
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Formation of Solutions Ethanol with water: disorder increases and change in energy is negative (exothermic dissolution), both H 2 O and ethanol form hydrogen bonds
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Formation of Solutions Break dispersion forces Break H-bonds & dispersion forces in H2O Make equivalent H- bonds & dispersion of forces in the solution
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Formation of Solutions Shake What will happen if we add dichloromethane to water? No change
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Formation of Solutions Dichloromethane with water: Disorder increases, but ‘delta’E is unfavorable . (Break strong H ····O make weak Cl ····O, etc.) don’t want to make weaker bonds
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Enthalpy of Solvation
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Formation of Solutions “Like dissolves like.” Here we mean solvents & solutes with similar intermolecular forces.
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This note was uploaded on 04/07/2008 for the course CHEM 115 taught by Professor L during the Fall '02 term at Purdue University-West Lafayette.

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Lecture_17 - Lecture 17, 11/22/07 Solutions Reading:...

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