acid base - 4/27/11 1 Announcements No lab reports due next...

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Unformatted text preview: 4/27/11 1 Announcements No lab reports due next week Complete your pre-lab notebook Copy and complete the flow chart in your notebook The flow chart serves as the reactions for the pre-lab The first exam will be on March 9 th at 7-8 pm. Look on Compass for locations TBA. [Conflict exams for those in MCB250– Thursday morning, and a few others by arrangement] Lab 4 will be in classrooms. Look for your room and time on Compass. Watch your waste streams! I will not be available for office hours next week. Please contact me for alternative arrangements. Acid/Base Extraction Laboratory 3 4/27/11 2 Liquid/liquid extraction Extraction is a method to purify solids and liquids Extraction separates compounds based on relative solubilities in liquids Use 2 immiscible solvents Typically use an aqueous and an organic solvent Compounds must be soluble in organic solvent 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 4/27/11 3 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 How extraction is done Let’s separate these three molecules using extraction: 1. Dissolve the mixture into dichloromethane 2. Add an aqueous solution Which aqueous solution? 4/27/11 4 Where will compounds go? Organic compounds will partition to the organic solvent layer How do we force organic compounds into the aqueous layer? Make them ionic Exploit functional groups by using acid/base chemistry Extraction reagents 4/27/11 5 Adding acid If we add an acidic aqueous solution, what will happen?...
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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 - 4/27/11 1 Announcements No lab reports due next...

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