Lecture_5

Lecture_5 - Lecture 5 Extraction Techniques Drying Organic...

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Unformatted text preview: Lecture 5 Extraction Techniques Drying Organic Liquids Recrystallization Experiment 4 NMR Spectroscopy A. Anhydride B. Amide C. Acid Chloride D. Carboxylic acid A. Anhydride B. Amide C. Acid Chloride D. Carboxylic acid A. The sample most likely contained impurities caused by contamination from another student B. The melting point apparatus was increasing too rapidly in temperature C. The sample reflects benzoic acid at its eutectic point with another material D. Both a and c E. None of the above A. The sample most likely contained impurities caused by contamination from another student B. The melting point apparatus was increasing too rapidly in temperature C. The sample reflects benzoic acid at its eutectic point with another material D. Both a and c E. None of the above A. It will increase the energy B. It will increase the wavenumber C. It will lower the wavenumber D. It will lower the energy E. C and D are both correct answers A. It will increase the energy B. It will increase the wavenumber C. It will lower the wavenumber D. It will lower the energy E. C and D are both correct answers Must have 2 immiscible liquids The distribution of a solute between these two layers is governed by the partition coefficient (K) K = [A] org / [A] aq A = solute Do not confuse this with K a . Typical solvents used in extraction Ether, Ethyl Acetate, Dichloromethane Are these solvents top layer or bottom? Techniques Mixing Cap, invert, swirl Venting Allow pressure to be released Separating Bottom layer goes out bottom Top out top Question: Lets say you dissolve 1 gram of freebased cocaine (K = 4.0) in 15 mL water. How many grams will be in your aqueous layer after an extraction with 15 mL ether? What if you did the extraction 3 times? What if you just used 45 mL of ether in one big extraction? (remember, 1 g of material and 15 mL of water). A. You would recover more material overall B. You would recover less material than the first extraction in the previous method....
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Lecture_5 - Lecture 5 Extraction Techniques Drying Organic...

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