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Rates of Reaction Coursework.

Extracts from this document...

Introduction

Rates of Reaction Coursework. Introduction. In this piece of science coursework I will be experimenting how the rate of reaction between Sodium thiosulphate and hydrochloric acid is affected by the concentration of Sodium thiosulphate. I will measure the rate of reaction by mixing the different quantities of Sodium thiosulphate (50 - 10cm�) with a fixed quantity (5cm�) of hydrochloric acid in a Conical flask and placing the flask on top of a white sheet of paper with a cross clearly marked on it. I will then measure how long it takes for a chemical reaction to take place. The time might vary depending on the concentration of Sodium thiosulphate. I will do this by timing how long it takes for the cross to disappear. I will be measuring the quantity of sodium thiosulphate and hydrochloric acid I use, by using a 'pipette' and a measuring cylinder, which will allow me to precisely conduct my measurements. I will make sure that my experiment is fair by using a different measuring tube and pipette for each chemical. Prediction. I think that the rate of reaction between sodium thiosulphate and hydrochloric acid will increase as the concentration of the sodium thiosulphate solution increases. I state this because by increasing the concentration you're also increasing the amount of particles in the solution. If there are greater amount particles then there will be greater number collisions taking place and so the rate of reaction increases as well as the temperature. ...read more.

Middle

* By using the exact Conical flask and paper with a cross marked on it I will be able to discover a relative measure of the speed of the reaction in forming the same amount of sulphur. * I have to make sure that the hydrochloric acid I use remains at a fixed amount of 5cm� through out the whole experiment because I am going to be investigating how the concentration of sodium thiosulphate affects a chemical reaction and this means that I must only change the concentration of the sodium thiosulphate. Safety Precautions. During my investigation I am going to take the following safety precautions: * We should not eat or taste any form of substance. If we have any contact with a chemical, the part that has made contact should be washed immediately. Following those rules will prevent us from being poisoning or have any harm done to us. * It is vital to keep a certain distance from the chemicals whilst a reaction takes place, as the outcome is Sulphur Dioxide, which is a poisonous gas and can be dangerous to us living organism. We should handle this experiment with great amount of care. * A pair of goggles will have to be worn during the experiment in order to protect my eyes from any harm. * I would strongly advice people to wear an apron to protect their skin and clothing because it prevents the acid making any sort of contact with your skin and clothing. ...read more.

Conclusion

We already know that by mounting the concentration there will be greater amount of particles and this means that they are squashed up more, this will result with more collisions taking place because of the fact that there are more particles in a certain amount of area it will be easier for particles to collide with each other. I have also presented my results in the form of graphs, in order to make my results more understanding. This will also allow me to show that my results are similar to each other in a clear way. In conclusion my prediction was right because my results from the experiment agree with it. Evaluation. My evidence is extremely reliable, I state this because the experiment was repeated three times and this made the results even more accurate. For example I know that my evidence was very reliable because as you can see in the table above, my results were extremely similar to each other. My evidences were also supported by theories such as the collision theory and the kinetic theory. There were no irregular results in my experiment, because they were very similar as you can see in my graphs. If I was to do this experiment again I would make sure I repeat my experiment more times then I did to this one, so that I would have a higher level of accuracy, and this would be clearly displayed in the results. ...read more.

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