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What Affect Does Concentration Have On the Rate of a Chemical Reaction?

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Introduction

What affect does concentration have on the rate of a chemical reaction? Prediction I predict increasing the concentration the quicker the reaction will be this is due to the collision theory, which states that for a reaction to take place particles have to collide, and with enough energy. The more particles more collisions will occur. By adding a more concentrated solution more particles are added which means more collisions and this is why I think the reaction will be quicker. Diagram Plan We took 3 beakers, one that was filled with dilute water, another one filled with sodium thio sulphate. The third beaker was used for the actual experiment. We then took a glass full of hydro choleric acid. ...read more.

Middle

We kept the volume of the Hydro Choleric acid the same throughout the experiment as the whole idea of the experiemt was to see what affect concentration has on the rate of the reaction. Variables For this experiment we kept the same amount of Hcl in to make the experiment fair the variables were the sodium thio sulphate and the water. We controlled the variables by measuring them out accurately each time and making sure we didn't mix any of the to before hand to make it a fairer test. We did this by washing the pipette out after each time we had used it. Equation Na + S O (aq) + Hcl (aq) Na Cl (aq) + H 0 (I) ...read more.

Conclusion

Meaning that the less sodium thio sulphate the less particles which means that it will take longer for a reaction to take place. Evaluation I feel that the experiment went well. I felt that our results were fairly accurate as you can see from my graphs but because I rounded up the time to the nearest second my results could be slightly out. The equipment I worked with was good and I did not have any problems with it. To improve this experiment I believe that we would need to repeat the experiment a few more times to make our results more accurate. But I do feel that the results obtained show enough evidence for my conclusion. I believe that my experiment worked and if I did it again then I would spend more time getting more results to make it more accurate. ...read more.

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