• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Hydrolysis of benzamide

Extracts from this document...


Chemistry Experiment 26 (a) Title: Hydrolysis of benzamide (b) Objective: To prepare benzoic acid by means of hydrolysis of benzamide and calculate the percentage yield of this process. (c) Theory: Benzamide, like other amides, hydrolysis under acidic or alkaline conditions Acid hydrolysis (not involved in this experiment) (1) + H2O + NH3 Alkaline hydrolysis (2) + OH- + NH4+ From (2), when H3O+ is further added, benzoic acid is formed (3)+ H3O+ In reaction (2), the ammonium gas evolved is alkaline and can be tested by wet red litmus paper, it should turn from red to blue. ...read more.


Also a suction pump is connected below to speed up the filtration. The filtrate should then be washed to remove any impurities. Lastly, by weighing the initial and final mass of the benzamide and benzoic acid respectively, the percentage yield of the process can be calculated. Moreover, by testing the melting point of the resulting benzoic acid solid with the melting point apparatus, the purity of the product obtained can be estimated, since the purer the benzoic acid, the sharper the melting point and the nearer to its theoretical value (~126�C) ...read more.


Discussion: Sources of Error 1. Imurities was present in the original benzamide powder, hence the initial mass obtained may be higher that expected, thus the percentage yield calculated is lower than the actual one. 2. Some benzamide as well as benzoic acid powder may have lost during transfer, resulting in a low percentage yield. 3. Some benzoic acid solid may have dissolved in water during filtration and was discarded as filtrate, resulting in a loss of product and hence a low percentage yield. (f) Conclusion: The percentage yield of this process is 24.00% while the melting point of the resulting benzoic acid solid ranges from 123 to 127�C, with a percentage error of -2.38% ?? ?? ?? ?? ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Organic Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Organic Chemistry essays

  1. The aim of this experiment is to produce Aspirin. This is an estrification in ...

    25 cm3 Percentage error = 0.06 x 100 =+ 0.24% 25 Burette (class B) Percentage error = 0.05 x 100 =+ 0.593% 8.4250 Volumetric flask (class B) 250 cm3 Percentage error = 0.2x 100 = + 0.08% 250 Total percentage error = 0.00322 + 0.593 + 0.24 + 0.08 =

  2. investigating the amount of ascorbic acid present in fruit

    Use a pipette filter to pipette this out. 2. Again, use a white tile to make sure that the 4%KI is up to the meniscus line and that the dip is accurately on the line. 3. Take off pipette filter and release the 4% KI into the 250cm3 conical flask (where the ascorbic acid solution is).

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work