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Test three vinegars against the manufacturers’ to see who is diluting or ‘cheating’ on the vinegar.

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Introduction

Results All results are measured in millilitres, ml. Results of the method using pipettes, amount of alkali used to make solution neutral. Vinegar Replicate 1 (ml) Replicate 2 (ml) Replicate 3 (ml) Average (ml) Manufacturers' 19 16 17 17.3 Chip shop A 3 3 4 3.3 Chip shop B 8 9 8 8.3 Chip shop C 8 7 6 7 Results of the method using titration, amount of alkali used to make solution neutral. Vinegar Replicate 1 (ml) Replicate 2 (ml) Replicate 3 (ml) Average (ml) Manufacturers' 11.6 12.2 11.8 11.9 Chip shop A 6.1 5.7 6.3 6.0 Chip shop B 15.5 14.9 15.3 15.2 Chip shop C 10.5 11.3 9.8 10.5 Analysis The results differ greatly. The results from using the pipette method are all less than the results from using the burette method, except the ones from the manufacturers' vinegar. I am going to plot the results onto a graph but I think that this experiment hasn't succeeded its objective, as the results are so different. Conclusion None of the shops contained the same amount of vinegar as the manufacturers'. ...read more.

Middle

The accuracy of the experiment can be questioned from our abilities of reading the marks on the burette, the pipette etc, but also on our abilities to judge the colour of the solution. Everyone sees colour slightly differently as it is subjective, and it would be unfair to take results from just one person so we swapped at intervals to get different opinions. Any anomalies could have been due to poor workmanship, or there may have a mix up with the vinegars because of the work being spread over two weeks. Although we measured to 0.1 of a pH in the burette method, to improve the accuracy of the pH overall, it would have been better to use a pH probe. This probe can be connected to a handset used to calibrate the pH, and a data logger, which stores information. This data logger is connected up into a PC and can automatically create graphs of the pH levels you have collected. This would be a much more accurate way of collecting results. Our results are not very accurate and are therefore unsuitable and unreliable to make any lasting conclusion. ...read more.

Conclusion

I will then measure how much alkali is left in the measuring cylinder. I will take this away from twenty to see how much alkali it took to make the vinegar neutral. I will replicate this experiment three times to check I have an accurate set of results. Then I will repeat the experiment with three other vinegars to see whether they all take the same amount of alkali to make them neutral. Each of these vinegars will also have three replicates to ensure accuracy. Diagram of the pipette method Titration Method Alternatively, and I prefer this method, I will use titration. I will use a burette to measure each of the solutions and make them neutral. The vinegar and phenolphthalein will go in a beaker underneath the burette, and the alkali, or sodium hydroxide, will go into the burette. The burette holds 50ml of sodium hydroxide and I will put this much into it until it reads zero at the top. This will enable me to read off the amount that has been used very easily as it shows you on the side of the burette. I will still use 10ml of vinegar and 6 drops of phenolphthalein in the beaker under the burette. Diagram of the titration Diagram of the data logger ?? ?? ?? ?? Emma Warran-Smith ...read more.

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