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Preparation of the Grignard Reagent and Benzoic Acid

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Submitted By joshaudis4
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3/11/14

Experiment #36 and 36b Preparation of the Grignard Reagent and Benzoic Acid

Purpose-

In this experiment we learned to prepare a Grignard reagent, phenyl magnesium bromide,

which we then converted to a carboxylic acid.

Procedure & Observations-

First we started by setting up our apparatus for Grignard reactions. We started by making

sure all glassware was completely dried as a Grignard reaction would not occur if water

is present. We used a 100ml round bottom flask for our solution and placed it on a hot

plate to control the heating process. We then weighed out 0.4920g of magnesium turnings

and placed it into the round bottom flask. We also measured out 2.1ml of bromobenzene

into a 50ml flask and got a weight of 3.0557g. We then added 10ml of ether to the 2.1ml

of bromobenzene and pipetted half into the round bottom flask. The other half was then

added to the separatory funnel along with an additional 7ml of ether. From here we began

heating the mixture until boiling started to occur. Once the reaction started to begin we

got an instant brownish color change. We also ended up using a drop from another

group’s reaction to help move along the process. Once this happened we began slowly

adding the remaining bromobenzene over a five minute period. Once it had all been

added we added an additional 1ml of ether to rinse the funnel. We then heated under

gentle reflux till all the magnesium had dissolved. After this we allowed the phenyl

magnesium bromide to cool to room temperature where we then quickly poured over

10.82g of dry ice in a 250ml beaker. We then added 8ml of 6m HCl slowly to the beaker

and then rinsed the flask with 2ml of ether. From here we covered the mixture and

allowed it to sit until the excess dry ice had sublimed. We then began day 2

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