Saturday, May 11, 2019

PREPARATION OF BENZANILIDE FROM ANILINE AND BENZOYL CHLORIDE

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PREPARATION OF BENZANILIDE FROM ANILINE






REQUIREMENTS:

Apparatus:                                                                                     

Conical flasks, volumetric flasks, Pipette, Funnel, Beakers, Funnel, Test tubes, Balance, Spatula, Water bath, Stirrer, Filter paper etc

Chemicals:


                        Aniline……………………………………….. 05ml

                        Benzoyl Chloride ……………………………. 07ml

                        Sodium Hydroxide ……….…………………. 45ml

THEORY:

·         White to gray crystals, stable under ordinary condition, flash point 180 oC.

·         Solubility: It is insoluble in water, while soluble in ethanol.

·         Melting point: It is about 163oC.

·         Molecular weight: 197.21
PROCEDURE:



1)      Sodium  hydroxide and aniline solution was taken in a conical flask.

2)      Benzoyl chloride was added dropwise and the flask was shaken vigorously.

3)      I stoppered and shaken the flask for 15minutes.

4)      After 15minutes, I diluted with 100ml distilled water and shaken vigorously.

5)       In the end I observed that a mass was formed and it was filtered, washed and weighed.

6)      I also calculated the percent yield.

PRECAUTIONS:

1)      Wash the beakers before solution preparation.

2)      Weigh the ingredient carefully.

3)      Before re-weighing, must dry the crystals.

CALCULATION AND RESULT





Aniline



Molecular weight of aniline =          gm

01 mole of aniline is used =             gm

Mass of aniline taken =

                                   m = d×v

                                       =        ×

                                       =           gm





Benzanilide



 Molecular weight of benzanilide =            gm

01mole of benzanilide produced  =             gm

Mass of benzanilide obtained       =             gm





Percent Yield

      

  Actual yield of benzanilide        =          gm

  Theoritical yield of benzanilide = ?



           gm of aniline produces =              gm of benzanilide

           gm of aniline produces =        ×          .

                                                         

                                            =               gm

                                                                         

By the help of this we can find the %age yield, using the following formula;

                                                                           

                    Percent yield =           × 100

                                                  

                                          =             %

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