extraction - 1 Chem 341 - Extraction, Copyright - D.J. Dyer...

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Unformatted text preview: 1 Chem 341 - Extraction, Copyright - D.J. Dyer & SIUC Extraction and Separation of Benzoic Acid, 2-Naphthol and Naphthalene Important Concepts Extraction technique for isolating organic compounds Solvent polarity like dissolves like Acid base theory: pKas Density Partition CoefFcient Rotory Evaporator Part B - Two base extraction, p. 158 2 Chem 341 - Extraction, Copyright - D.J. Dyer & SIUC Introduction to Extractions- A technique for the isolation and puriFcation of organic compounds. Separatory unnel Stopcock A B- Solvents A and B are NOT miscible (like oil and water).- Usually one is organic (i.e. nonpolar) and one is aqueous (i.e. polar).- The organic layer may or may not be the top layer. This depends on density, or the ratio of mass to volume in g/ml.- The more dense solvent will go to the bottom: Density of water = 1.0 g/ml Density of diethyl ether = 0.706 g/ml Density of dichloromethane = 1.325 g/ml (methylene chloride) Less Dense More Dense- How can you determine which solvent is more dense? 3 Chem 341 - Extraction, Copyright - D.J. Dyer & SIUC Photo source: -http://orgchem.colorado.edu How Does an Extraction Work? Suppose you have three compounds (1, 2 & 3) that are dissolved in solvent A, but compound 3 is more soluble in solvent B. A B 1 2 3 2. Vent the fask to release pressure, then close stopcock. 1. Stopper and Shake the fask to mix contents. 1 2 3 Flask 1 2 3 3. Allow contents to settle, then open stopcock and let bottom solvent drain into fask or beaker....
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This note was uploaded on 04/04/2011 for the course CHEM 341 taught by Professor Staff during the Fall '08 term at SIU Carbondale.

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extraction - 1 Chem 341 - Extraction, Copyright - D.J. Dyer...

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