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Investigate what happens to the rate of reaction when the concentration of Sodium Thiosulphate is altered in the reaction between Sodium Thiosulphate and Hydrochloric acid.

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Introduction

Science Coursework- Rates of reaction investigation Aim The aim of this coursework is to investigate what happens to the rate of reaction when the concentration of Sodium Thiosulphate is altered in the reaction between Sodium Thiosulphate and Hydrochloric acid. Below is the reaction equation... Sodium + Hydrochloric Sodium + Water + Sulphur + Sulphur Thiosulphate acid Chloride Dioxide Na2S2o3 (aq) + 2Hcl (aq) 2Nacl (aq) + H2o(l) + So2(g) S(s) Prediction I predict that as the concentration of Sodium Thiosulphate decreases, the reaction time will increase. The reason I believe this is because the collision theory says, that when there is a high concentration of Sodium Thiosulphate, there are more particles of Sodium Thiosulphate floating around the water molecules, this increases the chance of collisions between the important particles so therefore it will take less time for the reaction to occur. Similarly, when there is a lesser concentration of Sodium Thiosulphate and a higher concentration of water, there are less particles of Sodium Thiosulphate floating around the water molecules, this decreases the chance of collisions between the important particles so therefore it will take more time for the reaction to occur. Method Equipment needed * 1 Bottle of Sodium Thiosulphate * 1 Bottle of Hydrochloric Acid * Water * 1 Beaker * 2 pipettes * 2 measuring cylinders * Goggles * Paper with "X" mark ...read more.

Middle

When it does I would stop the stop clock and note the time taken. 6. After finishing on experiment I would clean out the beaker and dry it out. I would then start the next experiment. Diagram of experiment and equipment used Safety Whilst doing my experiments I would ensure that the following safety aspects are met... * Bags and jackets are out of the way. * Goggles are on to protect the eyes. * If any liquid is spilled I would clean it up straight away. * If any chemical is spilled on the body, I would wash it straight away. Fair testing To make my test fair I am only going to change one aspect that will affect the rate of reaction. I will continuously change the concentration of Sodium Thiosulphate and keep the following the same... * The temperature. * I will not use a catalyst. * I will also use the same equipment and use the same paper with the "x" mark on it. The reason for this is because if I change the paper, it would affect the results because the "x" might be darker or lighter and this would take the "x" more or less time to disappear than the original paper. ...read more.

Conclusion

results I am now going to draw a scatter graph with a smooth line which will show me if the concentration affects the rate of reaction. Conclusion My smooth line on my graph of results clearly shows that concentration of a substance does have an effect on the rate of reaction. The graph shows that my prediction was correct, which was that as the concentration of Sodium Thiosulphate decreases the rate of reaction increases. Evaluation All my experiments went very well as there was not any mistakes made. I ensured that the fair testing and safety details listed above were met. Overall I think my results were very accurate as I got 3 results and worked the average for all of them, which I then used to create my graph. I also believe that my results were accurate because on my graph there were not any anomalous results. I ensured that the equipment, mainly the beaker was cleaned after an experiment. If I had more time I would improve my investigation by measuring out the substances used very accurately and also not to rush my experiments so that I could have more accurate results. Overall I think my investigation went very well. I got the results needed to answer my prediction and the coursework aim. I also think my results were accurate. Mohammed Ishfaq 11B1 1 ...read more.

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