acid base extraction 2011 SPRING white background1

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4/27/11 Announcements Ø No lab reports due next week Ø Complete your pre-lab notebook Ø Copy and complete the flow chart in your notebook Ø The flow chart serves as the reactions for the pre-lab Ø The first exam will be on March 9th at 7-8 pm. Look on Compass for locations TBA. [Conflict exams for those in MCB250– Thursday morning, and a few others by arrangement] Ø Lab 4 will be in classrooms. Look for your room and time on Compass. Ø Watch your waste streams! Ø I will not be available for office hours next week. Please contact me for alternative arrangements.
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Click to edit Master subtitle style 4/27/11 Acid/Base Extraction Laboratory 3
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4/27/11 Liquid/liquid extraction Extraction is a method to purify solids and liquids Ø Extraction separates compounds based on relative solubilities in liquids Ø Use 2 immiscible solvents Ø Typically use an aqueous and an organic solvent Ø Compounds must be soluble in organic solvent
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4/27/11 Immiscible liquids Miscible liquids will mix together in all ratios Immiscible liquids will separate in some ratios Water and oil immiscible Water and ethanol miscible
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4/27/11 Layering How do we determine which liquid will be on the top or bottom? DENSITY Liquids with higher density will “sink” Liquids with lower density will “float” Ex: oil and water
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4/27/11 How extraction is done NH 2 OH O Let’s separate these three molecules using extraction: 1. Dissolve the mixture into dichloromethane 2. Add an aqueous solution Which aqueous solution?
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4/27/11 Where will compounds go? Organic compounds will partition to the organic solvent layer
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This note was uploaded on 04/27/2011 for the course CHEM 233 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.

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acid base extraction 2011 SPRING white background1 -...

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