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# My aim is to investigate one effect of concentration on the rate of reaction between sodium thiosulphate solutions and dilute hydrochloric acid.

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Introduction

Investigation My aim is to investigate one effect of concentration on the rate of reaction between sodium thiosulphate solutions and dilute hydrochloric acid. The Apparatus I intend to use is as follows: * Beakers (250ml & 100ml) * Stop clock * Measuring cylinder * Paper with cross * Hydrochloric acid * Sodium Thiosulphate * Safety goggles * Conical Flask (100ml & 250ml) I predict that a higher concentration of sodium thiosulphate will increase the reaction rate and a low concentration will lower the reaction rate and increase the time taken for the reaction. HIGH CONCENTRATION = FAST REACTION = HIGH RATE = DECREASED TIME LOW CONCENTRATION = SLOW REACTION = LOW RATE = INCREASED TIME Explanation of prediction Increasing the number of particles in the same volume increases the chance that the particles will collide. This means that there will be more collisions in a given amount of time. Here is an example form a metal chip reaction experiment which was also on of my preliminary experiments: Method Firstly I will draw a cross on a piece of paper, and then I will put sodium thiosulphate into a beaker (50ml, 40ml, 30ml, 20ml, and 10ml) ...read more.

Middle

Water (ml) Hydrochloric Acid (ml) Tests Mean Rate 1 2 3 50 0 5 21 18 20 19.6 0.05 40 10 5 27 28 32 29 0.03 30 20 5 42 41 38 40.3 0.02 20 30 5 59 63 62 61.3 0.01 10 40 5 109 172 171 170.6 0.05 Analysis After I had taken the results (each concentration 3 times) I added the three results from the same concentrations together and divided them three, this gives my the mean time for each concentration . With this mean time I could now go on to work out the rate. From my table of results I have noticed certain trends: The higher the concentration the faster the reaction and the faster the time this gives you a high rate. Of course this means that if you lower the concentration the reaction is slower there for the rate is lower. These trends are true my prediction. I have plotted two graphs from my results. A graph to show the time vs. the volume of thiosulphate and a graph to show the Rate of reaction vs. ...read more.

Conclusion

I could have measured the volumes incorrectly, either by human error or by using the incorrect gauge on my measuring equipment. There could have also been human errors with the timing. * Could I have been More Accurate? I could have been more accurate by using a burette instead of a measuring cylinder to measure the volumes. Unfortunately this equipment was not available to me at the time of the experiment. I did how ever make the experiment as accurate as I could by using the equipment at hand. I did this by using the correct gauge of measurements for the specific volumes. E.G. a smaller gauge for the smaller measurements and a larger gauge for the bigger measurements this meant that the measurements were more accurate. * Were the results reliable The results are not really reliable because the experiment was not perfect. However the experiment was good enough for me as I was able to spot the trends. * Anomalous Results I did have one anomalous, but fortunately I was able to spot it early on in the testing and I was able to re-test it immediately. 1 Tom Bill Science Coursework ...read more.

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