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GCSE Chemistry Coursework: Investigating the rate of reaction

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GCSE Chemistry Coursework: Investigating the rate of reaction Aims My aim is to see by changing the temperature how the rate of reaction changes between Hydrochloric acid and Sodium thiosulphate. I think that the rate of reaction between Sodium Thiosulphate and Hydrochloric acid will change as higher the temperature of the Sodium Thiosulphate then the rate of reaction will increase as you pour the Hydrochloric acid into the experiment. Finally, increasing the temperature will cause the particles to move faster with more energy. This therefore will mean that they will collide more often and with greater energy. This means that there will be more successful collisions per second and ultimately will produce a faster rate of reaction Apparatus * Two Measuring Cylinder (to measure the volume of the acid and the chemicals) * Bunsen Burner (so we can before the experiment change the temperature of the Sodium Thiosulphate) * Two Beakers (to hold the chemicals in it. Also I use two so that the chemicals do not mix before I conduct the first experiment) ...read more.


Therefore after I had done all of this I would heat up the Sodium Thiosulphate in a beaker to the right temperature using a Bunsen burner. I will use many temperatures such as 200c, 300c, 400c , 500c ,and 600c so that I can get a range of results so that it will make it clearer. Then I will add the Hydrochloric acid. After this I would time this to see how long the reaction took to take place. I will know this when I have placed underneath the beaker a cross on a bit of paper, when this has disappeared from the chemical going cloudy I will know then when to stop the clock. Once I have gathered all my apparatus to do my experiment I would check that the Sodium Thiosulphate was at the right temperature by using a thermometer. I would then measure 30cm of Sodium Thiosulphate and 5cm of Hydrochloric acid and check that just before the experiment. Next I would pour 30cm of Sodium Thiosulphate into the beaker from one of my measuring cylinders and then pour in the 5cm of Hydrochloric acid. ...read more.


07:89 seconds 06:97 seconds 06:70 seconds 600c 05:79 seconds 04:59 seconds 03:49 seconds This table below will be showing the average rate of the time taken for the reaction to happen and therefore wills show the average time as well. Temperature (0c) Average Time (s) Rate (1/s) 200c 41.3 seconds 0.024 300c 19 seconds 0.052 400c 12.6 seconds 0.079 500c 7.3 seconds 0.136 600c 4.6 seconds 0.217 From these results in this table we can gather that throughout the experiment as the higher the temperature got the slower the rate was. This table represents what happened during the experiment and how fast the rate was, while the temperature was rising during each experiment. This therefore shows that the experiment was successful and fair as I recorded five different experiments to show the variation between the temperatures. I calculated the average time and at what temperature the reaction happened so that I could find an average rate. Overall I believe this table show that my experiment was successful as you can see from the results that I have recorded. ?? ?? ?? ?? Josh Lindsey 01/11/05 1 ...read more.

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