Extraction_Experimental - CHM2201 OrganicChemistry Lab I...

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CHM 2201 Fall 2009 Department of Chemistry Organic Chemist ry Lab I Villanova University Page 1 of 3 Extraction Determination of a Distribution Coefficient Week 6 – September 29 – October 5, 2009 From Bell, Clark and Taber, pgs. 41, 42 Apparatus required: 2 - 50 mL burettes (use one for benzoic acid solution and the other for NaOH solution) 1 - 250 mL Volumetric flask 2 - 250 mL Erlenmeyer flasks Magnetic stir bar 10 mL Graduated cylinder 125 mL separatory funnel 1 Ring Clamp Hot plate 1 - 50 mL Beaker A. Preparation of the Standard Benzoic Acid Solution 1. Weigh out 0.61 g of benzoic acid onto some weighing paper. 2. Place this benzoic acid in a 250 mL Erlenmeyer flask containing a magnetic stir bar and add 150 mL of water 3. Heat the resulting mixture on a hot plate with magnetic stirring until the benzoic acid completely dissolves to give a clear solution. 4. Using a funnel carefully pour the resulting solution into a 250 mL volumetric flask . Rinse the Erlenmeyer flask several times with water (three 20 mL portions) and pour the washes into the 250 mL volumetric flask. These washes ensure a quantitative transfer of all benzoic acid from the Erlenmeyer flask to the volumetric flask. 5. Cool the solution in the volumetric flask to room temperature and then CAREFULLY add water to the flask to adjust the total volume to exactly 250 mL (add water until the level reaches the 250 mL mark etched on the neck of the volumetric flask). This provides a standard 0.02 M benzoic acid solution. 6. Stopper the flask and invert it several times to ensure that the contents are mixed uniformly. NOTE: CARRY OUT EXTRACTIONS IN YOUR HOOD B. Single Extraction and Distribution Coefficient Determination 1. Using a burette, place 50 mL of the standard 0.02 M benzoic acid solution into a 125 mL separatory funnel. MAKE SURE THAT THE FUNNEL STOPCOCK IS CLOSED BEFORE THE ADDITION. 2.
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This note was uploaded on 02/20/2012 for the course CHE 118B taught by Professor Nasiri during the Winter '08 term at UC Davis.

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Extraction_Experimental - CHM2201 OrganicChemistry Lab I...

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