Lecture 5 Solubility(1)_Feb-8-2010

Lecture 5 Solubility(1)_Feb-8-2010 - Chapter 5: Solubility...

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Chapter 5: Solubility
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Solubility Aqueous solubility : equilibrium partitioning of a compound between its pure phase and water Definition: The abundance of chemical i per unit volume when in equilibrium with pure phase i at some T, P (C iw sat , S w ) Why is solubility important?
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Why is solubility important? Log K oc BioConcentration Factor (BCF) Initial Dissolution Rate (mg/cm 2 /h) @ 37 C Solubility (mg/mL) @ 37 C (Data of Hamlin et al., 1965) (K oc = organic-carbon normalized sorption coefficient) S w k dissolution S w K oc & BCF Decreasing Solubility high low
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Our Focus: Aqueous Solubility and Factors Affecting It Trends Thermodynamic Considerations Estimation Techniques Effects of – Temperature – Ionic Composition – Organic solvents – Surfactants – Dissolved Organic Matter (introduction) – pH (in Chapter 8) Mole fraction solubility (dissolution from mixtures)
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Range for Compounds of Environmental Interest – PCBs – 10 -4 to 10 -11 – n-alkanes – 10 -3 to 10 -8 – alkylbenzenes ~ 10 -2 (benzene) to 10 -5 (propylbenzene – PAHS ~10 -3 to 10 -10 – Cl-benzenes ~10 -2 to 10 -8 Size (MW) S Overall range >10-orders of magnitude Variation in S w is due to molecule- molecule interactions (and T m )
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Thermodynamic Considerations Phase transfer: Liquid → water Solid → water Gas → water iL iL iL iL x RT ln * for pure liquid i iw iw iL iw
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This note was uploaded on 08/28/2011 for the course ESE 544 taught by Professor Lee during the Fall '11 term at Purdue University-West Lafayette.

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Lecture 5 Solubility(1)_Feb-8-2010 - Chapter 5: Solubility...

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