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The aim is to find out how the rate of reaction is effected by a change in the concentration level of an acid.

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Introduction

Aim: The aim is to find out how the rate of reaction is effected by a change in the concentration level of an acid. Prediction: I think that the more concentration of acid there is, the faster the reaction will take place. This is because I know for a fact that an acid will react faster with Sodium Thiosulphate than water because acid is more reactive than the water. Theory : The more concentrated the reactants, the greater will be the rate of reaction. Increasing the concentration level of the reactants increases the particles. This is because increasing the number of collisions between the particles speeds up the process. So the more particles there are, the faster the rate of reaction. This also will explain why the greatest rate of reaction is usually as soon as the reactants are mixed, i.e. they are both at their highest concentrations. But we must consider what happens when a reaction takes place. ...read more.

Middle

* The same room because if we did half the experiment in one room and the other half in another room if would not be a fair test because the rooms can have different temperatures. Number of Measurements: I expect to try five different values for the acid and the water. So then I can assure myself that this experiment was no coincidence but a fact. Plan: 1. First I will gather all the equipment that I need and set them out on the working bench. Then I will get the acid, water and the Sodium Thiosulphate. 2. After that I'll have to wear the big bulgy safety goggles and get the stopwatch ready. 3. As soon as I've done this I'll pour out the amount required of acid in the beaker, followed by the correct amount of water and the Sodium Thiosulphate which will stay the same. After I've done this I've got to put the beaker on the ink cross which will help me with the experiment. ...read more.

Conclusion

25 15.53 20 16.66 15 21.13 10 23.26 5 25.36 Graph or Calculations: Conclusion: What I found out was that the more concentration of acid there is, the less time it took to react and vice Versa. Now looking back at my prediction, what I predicted was right and all thanks to all my science teachers since year seven, along with Mr. Ogunsola of course. The plots on the graph look pretty straight except (20, 16.66) which is a bit out of line. Review: The conclusion above that I've just written does go along with the prediction that I wrote earlier on. The more concentrated the acid the faster it will react. Accuracy: My Measurements were as accurate as I could make it. Because I measured all the substances from the eye level and was really sharp with the stopwatch. Pattern Breakers: Only on of my points on the graph was out of line probably because I was a bit terrible on the stopwatch on this particular test. Improvements: If I were given another chance to improve on this experiment I would have more tries with higher concentration of acid and with different amount of water. Mohammed Rahman ...read more.

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