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I am investigating the effects of the change in the concentration of a chemical on the rate of reaction

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Introduction

Experiment: The effects of concentration on the rates of reaction AIM: I am investigating the effects of the change in the concentration of a chemical on the rate of reaction PREDICTION: I predict that by increasing the amount of thiosulphate this will speed up the rate of reaction between the chemical and the acid. BACKGROUND THEORY There are many ways in which to effect the speed in the rate of reaction. These include: 1. Temperature - By increasing the temperature the faster the particle moves and the more collisions occur and this speeds up the rate of reaction. We will need to take into consideration the effect of temperature on the liquids and how this may effect the reaction. 2. Surface area - There are more particles that are able to react and therefore an increase in the surface area leads to a increase in the rate of reaction. ...read more.

Middle

and will be used to hold water and thiosulphate Pipette To be used to draw off hydrochloric acid from bottle Pipette filler This will be used to draw off slowly the acid. Stop watch To measure time taken for reaction to occur Beaker This will be filled with acid to ensure that the acid can be added to the solution in one amount Conical flask This will contain thiosulphate and water together and this is where the reaction will occur. Funnel This is used to ensure that the liquid does not spill out on to table. Safety goggles For overall eye safety and to ensure safety within laboratory. Laboratory coat To protect clothing. METHOD 1. The first task is to collect the equipment from the various storage areas in the chemistry laboratory. 2. You then fix the 2 burettes to the clamp stands to hold in place. ...read more.

Conclusion

Analysis: In this experiment I have found out that as the concentration increases the time taken for the reaction decreases. This mean that the rate of reaction increases as it takes less time for the reaction to take place and the cross to get disappeared. Even by using the graph with the best fit of line I can make a conclusion that the rate of reaction increases when the concentration increases. This shows that the procedure used was on the whole accurate and I got the results as I predicted. Evaluation: I think that my experiment went pretty well overall. My experiment would have been fairer and more accurate if I had done my experiment taking longer results and by taking temperatures. It can even be improved by having a water bath to ensure that the temperature of the water is always the same. Cleaning the burettes thoroughly every time even gives better result. All in all I say that more time and better resources would have given better results. Yasin Akbar Memon GCSE Science ...read more.

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