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

Compare the techniques and methods I used to measure the purity of a sample of aspirin.

Extracts from this document...


´╗┐Compare the techniques of measuring the purity of aspirin I am going to compare the techniques and methods I used to measure the purity of a sample of aspirin. I am going to talk about the good points and bad points of the techniques which I used. TLC Plate Chromatography The TLC Plate Chromatography method had its good points and its bad points. The good points about this technique were that you can estimate whether a sample of aspirin is pure or un-pure pretty easily. This is because the further up the sample reaches on the plate, that?s how pure it is. However this technique has a few bad points to it. Firstly we can?t achieve an exact estimate of the purity of the aspirin, it only gives a rough idea as to whether it consists of many impurities or if it is pretty pure. ...read more.


An un-pure sample will tend to melt over a range of degrees. I feel this technique is good because it is really quick and simple. However there is still chance for human error, if the temperature is not read correctly. Conclusion In conclusion I feel that the melting point was the best and the most accurate method of estimating purity of aspirin. This is because it does not consume much time and also it is really easy and simple. All that needs to be done is read the temperatures and it will show you whether the sample of aspirin is pure or not. TLC Plate Chromatography This method I think was fairly accurate because it showed the difference between the pure and the impure sample of aspirin. However it can?t be exactly precise to the percentage of purity. ...read more.


read of the exact end point result The amount of the phenolphthalein indicator used could either be too much or too less for the practical experiment Therefore basically for the titration practical?s you have to ensure to get accurate results you look closely at any measurements Melting point The melting point technique is fairly accurate however it could also lack errors. If I did not know of the actual melting point of a particular substance and I just tried random temperatures, it could tamper with the substance and my results. Whilst reading the temperature you might read it a few degrees above or a few degrees below. This would not melt the substance properly and wouldn?t provide you with accurate results. None of the results I obtained will be absolutely accurate because there could have been some sort of errors which occurred. I evaluated the techniques I used and discussed where they could lack in accuracy. ...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 Physical 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 Physical Chemistry essays

  1. Peer reviewed

    How does aspirin work?

    3 star(s)

    These 'super aspirins' selectively inhibit COX2 without blocking COX1, therefore reducing pain and inflammation with little damage to the gastrointestinal system. Asthma Asthma is a chronic lung disease making the airways sensitive, swollen and inflamed. In order to relieve an asthma attack bronchodilators are used, which interact with body cells relaxing smooth muscle tissue widening airways.

  2. To Estimate the Purity of Commercial Nitrite

    Final burette reading was taken. 8. The steps above were repeated for at least 3 times to obtain more results. 9. Calculation should be done. Observation: The permanganate solution changed from purple to colourless under the reaction.

  1. Describe the construction, operation and application of distillation equipment used in industry

    Sieve Trays: Have a greater liquid/vapour handling capacity than shower trays, but not as great as valve trays. Valve Trays: Has greatest liquid/vapour handling capacity of all the trays. Shower Trays: Least effective at handling liquid and vapour. e plate efficiency Bubble Cap: Bubble cap trays are not very efficient, about 70% as efficient as sieve trays and valve trays.

  2. Producing Aspirin By Vacuum Filtration

    another example is when in winter the, vehicles go around putting salt on the top of the snow, the salt decreases the melting point of the snow therefore making it easier for road users to drive. So having impurities will decrease the melting point but it increases the boiling point.

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