Preparation Of Phenyl Benzoate

EXPERIMENT ( 3 )

Topic :The expression of Phenyl Benzoate from benzoyl chloride

Introduction :The preparation of phenyl benzoate (ester) from phenol and benzoyl chloride is an esterification.
In this experiment, you are requested to prepare and sublimate phenyl benzoate by some techniques.

Chemicals :Phenol, Benzoyl chloride, Dilute NaOH, Methanol

Procedures :1.Dissolve 1 g phenol in 15 cm3 dilute NaOH using a 50 cm3 quickfit flask.
2.Add 2 cm3 benzoyl chloride, stopper the flask and perk up vigorously for 15 minutes. At the end of this time, a solidness product should be obtained.
3.Filter off the solid at the affectionateness, breaking up any lumps on the filter cover with a spatula.
Wash thoroughly with water and drain.
4.Recrystallise the crude ester from wood spirit using a quantity of hot solvent somewhat twice
the minimum required for complete solution (This is to ensure that the phenyl benzoate does not
speciate until the temperature of the solution has fallen below the melting point of the ester).
Phenyl benzoate separates as colourless crystals.
5.Determine the melting point of the product.

Results :Yield (mass in gram) = __________________0.



128 g_____________________
Melting point of pure phenyl benzoate (OC) = ___________70O______________
Melting point of your phenyl benzoate (OC) = ___________69O______________

Questions :
1.why do we use NaOH solution to dissolve phenol quite than water in step 1 ?
Because NaOH can be use to change the phenol to ion form, which can be more(prenominal) soluble in the aqueous solution.

2. Can we use ethanoyl chloride rather of benzoyl chloride ? Explain briefly.
No. Because it will produce another compound, phenyl ethanoate.

3. wherefore do we filter the product using a pump rather than filtration under gravity in step 3 ?
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