Bromination of Benzene Synthesis and Purification of...

BROMINATION OF BENZENE SYNTHESIS AND PURIFICATION OF BROMOBENZENE: PROCEDURE DATA TABLE Chemicalnbsp;nbsp;nbsp;nbsp;nbsp;Boiling point Cnbsp;nbsp;nbsp;nbsp;nbsp;Melting Point Cnbsp;nbsp;nbsp;nbsp;nbsp;Density g/mLnbsp;nbsp;nbsp;nbsp;nbsp;Solubility Benzenenbsp;nbsp;nbsp;nbsp;nbsp;80.1nbsp;nbsp;nbsp;nbsp;nbsp;5.5nbsp;nbsp;nbsp;nbsp;nbsp;0.88nbsp;nbsp;nbsp;nbsp;nbsp;Slightly in H2O Toluenenbsp;nbsp;nbsp;nbsp;nbsp;110.6nbsp;nbsp;nbsp;nbsp;nbsp;-93nbsp;nbsp;nbsp;nbsp;nbsp;0.87nbsp;nbsp;nbsp;nbsp;nbsp;Slightly in H2O†¦show more content†¦Synthesis of Bromobenzene: Set up a reflux and place in a cold-water bath. In addition to setting up the reflux apparatus, set up an inverted funnel gas trap. This will collect the hydrogen bromide gas in the water and not in our lungs when the reflux takes place. Pour 2.3 mL of benzene in the round bottom flask of the reflux apparatus. After this, pour the iron (III) bromide (FeBr3) into the same round bottom flask. If there is a vigorous initial reaction, wait until this has almost stopped and then heat the water bath to a temperature of 25-30O C to initiate the reflux. Reflux at this temperature for an hour. After an hour has passed, raise the temperature of the water to 65-70O C, and allow refluxing for about 45 minutes. At this point, the color of the liquid should be dark. At this point, the reaction between the benzene and the bromide molecules should be complete. Purification of Bromobenzene: Transfer this liquid to a separatory funnel, and shake and vent with a 10% aqueous solution of sodium hydroxide. The lower layer should be the bromobenzene layer. Drain this layer out into a beaker. Add water to the liquids in the separatory funnel, and again shake and vent to ensure the absence of bromide. Drain if necessary. After the extraction, the bromobenzene solution needs to be dried. Again, put anhydrous calcium chloride into a beaker with the bromobenzene and shake. Set aside for about 30 minutes. Decant this solution, and filter this