LAB 6 Chem - Experiment 6 Preparation of Benzoic Acid using...

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Unformatted text preview: Experiment 6 Preparation of Benzoic Acid using a Grignard Reagent By Piyush Padhi 5986178 Partner: Nicholas Huang (5985561) CHM 1321 TA: Po Heng Lin April 8 th , 2011 Department of Chemistry University of Ottawa Introduction The mechanism of the overall reaction Procedure / Observations Part A: Preparation of Grignard Reagent Table 1: Table of reagents Mol. Wt (g/mol) Density (g/ml) Amount (g/ml) Moles (mol) Magnesium Turnings 24.3050 1.738 0.80 g 0.0329 Iodine 126.90447 4.933 0.27 g 0.00213 Bromobenzene 157.01 1.495 3.0ml 0.0291 Diethyl Ether Anhydrous 74.1216 0.7134 20 ml 0.192 Table 2: Observation of the Grignard reaction Initial Appearance of the reaction mixture Appearance of the Heated Reaction Mixture Dark brownish colour but somewhat clear Presence of bubbles meaning reaction was occurring. Finally the reaction was dark brown and clear.- For obtaining a proper amount of yield, it is very important to have all the glassware completely dry with no water residue. The glassware was cleaned with acetone and dried in an oven for 20 minutes. - In the drying tube a piece of cotton then the anhydrous calcium chloride, then cotton again was put.- In the initial preparation of the Grignard reagent 0.81g of magnesium turnings, two pieces (0.27g) of iodine, one half of a mixture of 20.0mL of anhydrous diethyl ether and 3.0mL of bromobenzene was placed in the round bottom flask. The observations were documented.- The reflux apparatus was quickly reassembled. This mixture was swirled until the red colour subsided and bubbles starts to form....
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LAB 6 Chem - Experiment 6 Preparation of Benzoic Acid using...

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