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The effect of changes of concentration on the rate of reaction.

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Introduction

The effect of changes of concentration on the rate of reaction. Aim: The aim of the experiment is to investigate how the difference in concentration affects the rates of reaction. I will measure the rate of reaction using the solutions sodium thiosulphate and hydrochloric acid. Introduction: Reactions occur at different speeds, a dynamite exploding is at a fast speed and a car rusting is at a slow speed. The different speeds of a reaction are very important and are referred to as their rates. For a reaction to occur particles must collide with each other and the collision must have enough energy. To know how fast a reaction is going to be you need to know the rate of each reaction. Rate is a measure of how fast or slow something is. Prediction: I predict that if the concentration of hydrochloric acid is increased the faster the rate of reaction will be. If the concentration of hydrochloric acid is decreased the rate of reaction will be slower. The rate of reaction can be affected by several different factors. Changing these factors can make the rate of reaction increase or decrease in speed. ...read more.

Middle

5. First measure 20cm� of sodium thiosulphate using a 20cm� pipette then add it to a small beaker. 6. Then use the other 20cm� pipette you have and measure 60cm� of hydrochloric acid. To get 60cm� use the 20cm� pipette three times. When you use the two pipettes make sure you keep one pipette for the thiosulphate and one for the hydrochloric acid. If u mix both pipettes the chemicals will react and disrupt the experiment. 7. When you have to make other concentrations including some water, you can add the water in to the same beaker as the hydrochloric acid, but the hydrochloric acid and thiosulphate must be kept apart until the experiments begins to avoid the chemicals reacting. 8. You or your partner (depending on who's measuring the substances and recording the results) must place the paper marked with a cross under the beaker of thiosulphate. A stopwatch must also be present near by. 9. Then pour the hydrochloric acid solution into the small beaker, as soon as all the contents of the beaker are in the other beaker start the stopwatch and start timing. ...read more.

Conclusion

The graph tells me that if the concentration of the solution is higher, the graph tells me that if the concentration of the solution is higher, the faster the rate of reaction will be. And the lower the concentration the slower the rate of reaction will be. This proves that the prediction I made earlier is correct. Evaluating: I think the experiment I conducted was a success. There weren't any serious problems, which meant I was able to complete the experiment. Nonetheless the accuracy of my results could have been improved. Instead of me and my partner having individual roles we combined the jobs. We didn't have a set thing to do, we both recorded the results and we both studied the reactivity of the two substances. This isn't very accurate as one of us might have better eyesight than the other, causing different recordings of the results. It would've been more precise if one of us had the job of timing and observing while the other measured and recorded the results. However, we didn't change jobs often enough for the results to be completely disrupted, just once or twice. This would still count as a fair test, I still believe that this experiment was a success as there were hardly any mistakes made. ...read more.

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