Question

conversion from aniline to acetanilide

Answer 1

Apparatus
Round bottom flask (100 ml), water condenser, wire-gauze, tripod stand, burner, iron-stand, clamp, measuring cylinder, etc.
Chemicals Required
Aniline = 5 ml
Acetic anhydride = 5 ml
Glacial acetic acid = 5 ml.

Procedure

Take 5 ml of acetic anhydride in a clean dry 100 ml conical flask and add 5 ml of glacial acetic acid and shake the contents thoroughly.
To this mixture taken in the flask, add 5 ml of aniline and fit a water condenser.Place the flask on a wire-gauze placed on a tripod stand as shown in Fig.Boil the mixture for 10-15 minutes.Allow the mixture to cool. Detach the condenser and pour the liquid into about 150 ml ice-cold water contained in a beaker. During addition, stir vigorously the contents of the beaker with the help of glass-rod.Filter the white precipitates which separate out and wash with cold water
 Recrystallise from hot water containing a few drops of ethyl alcohol. Weigh the crystals and record the yield.Determine the melting point of the compound.

Result
Weight of acetanilide obtained =…………g
Melting point of acetanilide = ……..°C
Note: Acetanilide has white flaky crystals. Its melting point in 113°C.

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