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How does concentration affect the time a reaction takes to complete?

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Introduction

How does concentration affect the time a reaction takes to complete? Introduction I am going to do an experiment to find out how the concentration of a base affects its reaction time with an acid. In this experiment, the base will be sodium thiosulphate, and the acid will be hydrochloric acid. Prediction I predict that as I use less and less sodium thiosulphate in my solution the reaction will take longer to happen. Reason I have based my prediction on the collision theory. The collision theory says that as particles collide, a chemical reaction takes place and as there are less and less particles they don't collide as often so the reaction takes longer. ...read more.

Middle

The total volume of the solution will remain 55cm cubed throughout the experiment. I will achieve this by adding water to the solution. For example, when I add 5cm cubed of hydrochloric acid and 40cm cubed of sodium thiosulphate, I will add 10cm cubed of water so the concentration of the base actually changes. I will first start by putting 5cm cubed of hydrochloric acid into the flask, I will then add 50cm cubed of sodium thiosulphate, I shall time how long it takes the solution to turn opaque. I will then repeat this with 40cm cubed of sodium thiosulphate and 10cm cubed of water to keep the volume at 55cm cubed. ...read more.

Conclusion

Results Here is a table of my results: All of my results are correct apart from one, it is the last result for the 30cm cubed of sodium thiosulphate. It is much higher than any of the other results which means that it must be incorrect. My results show that as less sodium thiosulphate is added, the reaction slows down. Graph 1 shows my results. Conclusion As my results show, as less sodium thiosulphate is added, the reaction speed slows down. This is because there are fewer particles for the hydrochloric acid to collide with. The reaction only happens because when the sodium thiosulphate particles collide with the hydrochloric acid particles, there is a reaction, this reaction creates sulphur. As there become less and less particles to collide with, the reaction takes longer to happen. ...read more.

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