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Factors affecting rate of reaction.

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Introduction

Factors affecting rate of reaction We are trying to investigate the factors affecting the rate of reaction between thiosulphate and hydrochloric acid Apparatus 1st experiment Changing the amounts of sodium thiosulphate and water 2nd experiment Changing the temperature Method We conducted two experiments to see what factors affect the rate of reaction. We drew a cross on paper and placed it underneath the beaker then we mixed sodium thiosulphate, water and hydrochloric acid together in the beaker and started the stopwatch. When we could not see the cross we stopped the stopwatch and recorded the results. On our first experiment we varied the amount of water and sodium thiosulphate but kept the same amount of hydrochloric acid in every time (5ml). On our second experiment we keep the same amount of water, sodium thiosulphate and hydrochloric acid in but we changed the temperature of the solution. ...read more.

Middle

This is because the water slows the reaction down so the less water you have the faster the reaction. Our results from the varying temperature experiment shows us that the higher the temperature the faster the reaction. This is because when you heat the particles up they have more kinetic energy (move much faster) meaning more harder, successful collisions. This means that the reaction will be faster. For example: Evaluation On both the experiments we did the first and last tests twice to make sure that the range was rite. These could be different because of a variety of reasons, for example on the varying amounts experiment more or less hydrochloric acid could have been added. This would cause the results to change. Perhaps the cross had not fully gone out of sight when the watch was stopped because it was quite hard to judge when the cross had fully disappeared. ...read more.

Conclusion

If we spilt anything we moped it up with a wet cloth to dilute it and so no one gets it on them. We made it a fair test by making sure that we washed out the beaker every time we used it so no excess hydrochloric acid on anything could affect it the next time, we also tried to fill the beakers to the exact amount however you cant get it spot on the same every time. If we were to repeat the experiment we would spend more time making sure that the amounts were exact every time. We would also use the same person to stop the watch when the cross had disappeared so that the results are as accurate as they can be each time. This is because different people have different times on when they think that the cross had disappeared. Ross Hawkings ...read more.

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