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# An Investigation into how the concentration of a solution affects the rate of a reaction.

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Introduction

An Investigation into how the concentration of a solution affects the rate of a reaction Background Knowledge I know of a way that the concentration of a solution affects the rate of a reaction. When putting dirty clothes to the wash, the more tablets you us the higher the concentration which means the stains are removed quicker. The concentrated washing powder solution sped up the reaction. Plan I am going to investigate the reaction below: The same person is going to take the time and the same person is going to check each time when the X cannot be seen. Apparatus * A conical flask * 2 measuring cylinders * 3 beakers * Hydrochloric Acid * Sodium Thiosulphate * Water * A stop watch Diagram Method * For the first calculation I will fill the conical flask with 50 ml of Sodium Thiosulphate and 10ml Hydrochloric acid. * There will be an X wrote in pencil on a piece of paper under the conical flask. ...read more.

Middle

The same size conical flask the same person will be timing the stopwatch. And the same person will be judging how long it takes for the cross to become invisible Predictions I would predict to find that the more water that is added to the sodium thiosulphate solution would mean a lower concentration, which would mean a slower reaction. This means the higher the concentration of Sodium thiosulphate would mean the reaction would be faster. This is because the more concentrated a solution, the more particles are colliding. I would also predict that the rate of reaction has increased if the time has decreased as the reaction has occurred a lot quicker so therefore the time taken is a lot less. Results table Volume of 40g Na�S�O� (cm�) Volume of Water (cm�) Concentration of Na�S�O� (g/l) Time taken For X to disappear Av Time (s) Time 1 (s) Time 2 (s) 50 0 40 43 39 41 45 5 36 48 45 46.5 40 10 32 52 54 53 35 15 28 59 63 61 30 20 24 79 ...read more.

Conclusion

I also predicted that the rate of reaction would increase if the time had decreased as the reaction had occurred a lot quicker so therefore the time taken is a lot less. Evaluation Overall my results were good, my points were all good except one which seemed to be anomalous. However the reason for this anomalous point could be because the beaker wasn't cleaned out properly. It could also be because any access water hasn't been dried out of it thus meaning the reaction could have contained a lower concentration than it should have. To improve your results you should rinse out the substance left and then dry the conical flask out. In the future I could investigate how temperature affects the rate of reaction between sodium thiosulphate and hydrochloric acid. Another improvement could be that when doing the results that took less time, it would have been more accurate to have two people so one person could put the substances together while the other person started timing. ...read more.

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