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Aim: To find out how much the concentration affects the reaction below. Thiosulphate ions + Hydrogen ions Sulphur dioxide + water + Sulphur

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Introduction

Science Coursework Aim: To find out how much the concentration affects the reaction below. Thiosulphate ions + Hydrogen ions --> Sulphur dioxide + water + Sulphur List of Apparatus Sodium Thiosulphate Sulphuric acid Distilled water Measuring cylinders x2 Glass beaker x2 Stop Watch Prediction I think that the rate of reaction will increase slowly when the concentration of the sodium Thiosulphate solution decreases due to an increase amount in the distilled water. I think this will happen because the rate should rise as there is less acid to react with and the water will raise the reaction also. Planning There will be a number of things I will investigate during my investigation. These are the factors that I believe could affect the rate of reaction 1) Heat 2) Catalysts 3) Concentration 4) Surface Area I will need to measure the following items in my investigation. 1) ...read more.

Middle

4) Repeat step 1 and add the correct amount of distilled water if required. 5) Repeat steps 2 and 3 and record the results into a table. Results The table below shows the results my group gathered after trying the investigation twice we recorded are results into this table and then worked out the averages for each concentration. We will use the Averages as are markers on the Graph. Volume of Thiosulphate Volume of Water Time 1 Time 2 Averages 60 0 7 6 6.5 50 10 7 7 7 40 20 9 10 9.5 30 30 12 21 12 20 40 17 17 17 10 50 33 32 32.5 The measurements in the graph were all measured in cm3 Analysis The Graph shows us that as the volume of the Thiosulphate decreased and the volume of the water increased it took longer for the reaction to occur. ...read more.

Conclusion

The results we got from repeating the test we similar and we were able to use these to get are average. When plotted on to are graph all the results are relatively close to the line of best fit showing we have no anomalous points. The method we used was time consuming but fair it allowed us to record the right amount of each substance and gave sufficient time to do the experiment. The method could have been inaccurate in a couple of ways the first of, which is the stopwatch as it is human, operated wouldn't have been precise. If we were to do the experiment again I would make sure that we used a couple of stopwatches each time and took the average reading. I would also do the experiment more than 3 times, as this would give us a more accurate measurement. All in all the investigation gave us a good set of results and was set up well this enabled us to get the best results possible and gave a greater understanding of chemical reactions to me. ...read more.

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