This is a lab on the synthesis of Benzil. These are the steps performed: 1. Plac

Question

This is a lab on the synthesis of Benzil. These are the steps performed:

1. Place 1 g of benxoin and 3 mL of concentrated nitric acid in a 50 mL beaker.

2. Heat the mixture on a steam bath for 15 min.

3. At the end of this time, add 30 mL of cold water to the reaction mixture.

4. Vaccum filter the product. Press the crystals with a clean glass stopper to remove as much of the water as possible.

5. Recrystallize the material from 95% ethyl alcohol.

6. Allow the product to air-dry for at least 30 min. Determine the melting point of the product, calculate the overall yield.

What oxides of nitrogen are produced in this reaction?

Explanation / Answer

Pure benzil has a melting point between 94-96oC.

Mainly NO2 is produced as a by product of oxidation.

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