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The preparation of Benzoic acid from benzamide

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Introduction

EXPERIMENT ( 4 ) Topic : The preparation of Benzoic acid from benzamide Introduction : The preparation of benzoic acid from benzamide is a hydrolysis. In this experiment, you are requested to prepare and purify benzoic acid by some techniques. Chemicals : Benzamide, Dilute NaOH, Dilute HCl Procedures : 1. Weigh out 3 g of benzamide. Place it in a 100 cm3 (or larger) conical flask and add to it 50 cm3 of dilute sodium hydroxide solution. 2. Fit the flask with a cork carrying a glass tubing and boil the mixture for about 15 minutes. Test the gas evolved at the open end of the glass tubing when the mixture begins to boil. ...read more.

Middle

Results : Gas evolved = _________________ammonia________________________ Test for gas = __________________pH paper________________________ Yield (mass in gram) = _______________0.88 g______________________ Colour of crystals obtained = ______________white___________________ Shape of crystals obtained = ____________irregular shape______________ Questions : 1. Is benzamide soluble in (a) water & (b) aqueous sodium hydroxide ? Benzamide is not soluble in water, but soluble in aqueous sodium hydroxide. 2. Write equations for the reactions involved. 3. What is the function of the glass tubing in step 2 ? When the solution is boiling, releasing the pressure. 4. After boiling for 15 minutes in step 2, what is the appearance of the reaction mixture ? ...read more.

Conclusion

8. Calculate your percentage yield. No. of mol of benzamide = 3 / (77+12+16+14+2) No. of mol of benzamide = 0.02479 mol. No. of mol of benzoic acid = 0.88 / (77+12+16x2+1) No. of mol of benzoic acid = 0.007213 mol. Percentage of yield = 0.007172/0.02479 x 100% = 29% 9. What criteria are usually used to judge whether a preparation method is good ? Comment on the suitability of the above experiment to be employed as a preparatory method for benzoic acid. The percentage of yield is usually used to judge whether a preparation method is good. The above experiment is not quite suitable to be employed as a preparatory method for benzoic acid, because the yield is too low. ...read more.

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