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The effect concentration of hydrochloric acid has on the rate of reaction -- A* - page 7
Keywords: Rate of reaction hydrochloric acid sodium thiosulphate concentration
By georgie1 on 31/12/2009
Level: GCSE Key Stage 4 (Years 10-11)
Page Number: 7 of 8 pages: 1 2 3 4 5 6 7 8For example, I would use concentrations of 0.0M, 0.1M, 0.2M, 0.3M, 0.4M, 0.5M, 0.6M, 0.7M, 0.8M 0.9M and 1.0M. By doing this, I would have even more evidence to base my conclusions upon.
Method
When completing my experiment I did not experience any major problems. When filling the burette with the sodium thiosulphate, I sometimes poured the chemical in too quickly; causing the burette to overflow. As a result, sodium thiosulphate ran into the conical flask, which would have meant that there would be more than just the 50cm³ of the substance in the flask and could have produced inaccurate results. This meant I had to use a different conical flask that was thoroughly clean and dry to ensure that no excess substances were already in it, so that I could obtain optimum accuracy. I am confident that the technique of mixing, same sized conical flasks, and same volume of reactants were all accurately and consistently controlled throughout the experiment. However, maintaining the same temperature of every solution was more difficult because of the exposure to a heater [as previously mentioned].
All of the equipment that I selected was appropriate for the investigation and I used all of the apparatus that I expected to need. When collecting my results, I used precise instruments [e.g. burette, measuring cylinder, and stopwatch] to ensure that I obtained the most precise results possible. This was a much more accurate and reliable way of measuring than predicting or guessing measurements. The stopwatch measures to two decimal places, which is adequate and precise for the experiment. Because the readings are electronic, they are very accurate. The burette and measuring cylinder measure in degrees of millimetres³ [mm³], which ensures that each centimetre³ is extreme precise and that I measure very accurately.
If I was to repeat the experiment, I would measure more concentrations of hydrochloric acid in the 0.0M- 1.0M bracket [as previously mentioned], or would measure to higher concentration, such as 2.0M. I could then draw a conclusion in more depth to see at what exact point the rate of reaction begins to increase less rapidly, and/or reach its maximum. I would do all of the experiments on the same day, to ensure that there was minimal temperature/visibility change, which could affect results if varied. I would also repeat each concentration a lot more times so that my averages are stronger and more definite, in order to be fully
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