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Who's cheating on the vinegar?

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Chemistry Course Work - Neutralisation of ethonoic acid Who's cheating on the vinegar? Task: A chip shop owner buys his vinegar from 4 different suppliers A, B, C and Safe way. He suspects that at least one of them waters down the vinegar supplied to them by the manufacturer. You are the analytical chemist assigned to investigate this. You have already planned an experiment that will give you the evidence you need. The following results have been taken from a similar experiment. Your task is to analyse these results and present your conclusion. You must then evaluate the experiment by assessing its success in answering the original question, explaining any anomalous results, and suggesting any possible improvements. Aim: I have been asked to find out if any of the suppliers have been watering down the vinegar they have supplied to the chip shop owner. I will do this by using a technique called Titration. Vinegar is ethonoic acid What is Titration? ...read more.


the difference between the molarity of the acids can tell me which has been watered down the most. Prediction: The acid with the lowest molarity has been watered down, but unless I test pure ethonoic acid, or find out its molarity then I don't know if the highest molarity of acid has been watered down. Diagram: Method: Step 1: Wash out all equipment. Step 2: Set up the stand and fit the burette in place with the clamp above the conical flask. Step 3: Take out the burette and fill with sodium carbonate. Step 4: Measure the first acid (shop A) in the pipette then put into beaker underneath, then take the conical flask from under the burette and pure in acid. Step 5: Dilute the acid with pure H2O so there is a higher volume to work with Step 6: Start the titration by turning the tap of the burette very slightly and adding a small amount of sodium carbonate at a time. ...read more.


Shop B = 0.021 M 3. Safe Way = 0.014 M 4. Shop C = 0.0088 M Conclusion: The acid with the lowest molarity has been watered down. I know this because it took less alkali to neutralise it. Shop B, Safe Way and Shop C have obviously been watered down because they have a lower molarity than shop A. So the chip shop owner should only buy shop A vinegar as it is the strongest and he is getting more vinegar for his money. Evaluation: To ensure my experiment was a fair test I had to make sure all the variables were the same. I made sure the factors, which needed to be constant, were constant, for example the volume of vinegar was measured accurately. I also made sure any human errors such as not switching the tap off in time were to the best of my ability. This made the experiment a fair test. These are important factors because it can be detrimental to how accurate my results are. The test was a success because we found out which was the strongest vinegar for the chip shop owner to buy. ...read more.

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Response to the question

The focus on the question is done well, and the candidate shows good basic research behind the topic. The candidate needs to make sure they understand basic theory to avoid errors that are seen in some places.

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Response to the question

The focus on the question is done well, and the candidate shows good basic research behind the topic. The candidate needs to make sure they understand basic theory to avoid errors that are seen in some places.

Level of analysis

The task is very interesting and is outlined well. They outline the background and theories behind the experiment well explaining the different concepts. Their theory is correct, but they should explain the reasoning behind this using the collision theory. They do not indicate the indicator they are going to use to note the colour change and this would be good to include because it would show understanding of how to choose the best indicator colour. The candidate is wrong in their theory, as the alkali with the strongest molarity needed the most alkali to neutralise it, so they should rethink their answer. The evaluation is good, but needs to expand more on things that could be improved in the experiment to make it better.

Quality of writing

Punctuation, grammar and spelling good throughout. Format is split up clearly. No diagram included where it should of been or it doesn't show in the PDF.

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Reviewed by skatealexia 25/08/2012

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