Lecture 2 - Enthalpy of solution The energetics of solution are complicated Enthalpy to overcome intermolecular forces in solute Magnitude depends

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Enthalpy of solution Enthalpy of solution W The energetics of solution are complicated Enthalpy to overcome intermolecular forces in solute Magnitude depends on compound Magnitude depends on compound Large for polar, ionic compounds Large for polar, ionic compounds Enthalpy to overcome intermolecular forces in solvent Enthalpy of solvation (hydration when water is solvent) W Net result: like dissolves like Polar substances dissolve in polar solvents Nonpolar substances dissolve in nonpolar solvents
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Energetic of Energetic of Solvation Solvation
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Non Non - - ideal behavior ideal behavior 50 mL water 50 mL ethanol
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Factors affecting solubility Factors affecting solubility W Structure controls polarity, and therefore solubility Fat soluble (hydrophobic) vs. water soluble (hydrophilic) vitamines W Pressure: Henry’s Law M = k H P k H varies with gas and temperature For most gases, k H decreases at higher temperature W Temperature Most salts are more soluble at higher temp., but depends on sign of H solution
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Solubilities Solubilities of gases of gases
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Solubility and Temperature Solubility and Temperature
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This note was uploaded on 04/05/2008 for the course CHEM 161, 101 taught by Professor Hansell during the Spring '08 term at Rutgers.

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Lecture 2 - Enthalpy of solution The energetics of solution are complicated Enthalpy to overcome intermolecular forces in solute Magnitude depends

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