143A Exprmnt 4a Pre-lab

143A Exprmnt 4a Pre-lab - Name: _ Date: _01-26-2011_ TA...

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Name: __________________ Date: __01-26-2011 __ TA signature: _________________________ Experiment #: __4a _________ Chemicals to be Used Today: o-hydroxyacetophenone in TBME p-hydroxyacetophenone in TBME 30:70 ethyl acetate:petroleum ether iodine [I2 crystals] acetylsalicylic acid acetaminophen caffeine ibuprofen ethyl acetate Equipment to be Used Today: 100 mL beaker Silica gel wick (cut filter paper) development jar (the 100 mL beaker) watch glass Silica gel TLC plates pencil capillary tubes Iodine visualization jars UV lamps Fume hood Procedure: I: TLC analysis of ortho-hydroxyacetophenone and para-hydroxyacetophenone 1. Use a pencil to mark the origins of three "lanes" 1 cm from the bottom of the coated side of a silica gel TLC plate. 2. Dip a capillary tube into a 1% TBME solution of o -hydroxyacetophenone. 3. Touch the end of the capillary tube to the pencil mark in lane 1 on the TLC plate. Do this very quickly but gently to transfer the smallest drop of solution possible to the TLC plate. 4.
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143A Exprmnt 4a Pre-lab - Name: _ Date: _01-26-2011_ TA...

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