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To investigate the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid

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Introduction

GCSE Chemistry Coursework Investigation To investigate the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid Aim My aim is to create an experiment so that I can measure the difference in reaction rates when Sodium Thiosulphate and Hydrochloric Acid are heated. When Sodium Thiosulphate and Hydrochloric acid are mixed they react to form Sulphur. It is the Sulphur that makes the reaction cloudy and the experiment is to see how long it takes for this solution to become cloudy when heated at different temperatures. Factors Involved and Fair Testing This experiment will contain only one variable, the temperature. The constants are:- * The concentrations of the Sodium Thiosulphate and Hydrochloric Acid. Also the volumes need to be kept constant so to keep the investigation fair. * The apparatus used in the experiment needs to be kept exactly the same for each different temperature. If we use any apparatus that will need to be used in the next experiment we need to make sure that we wash them thoroughly so to avoid unnecessary reactions. I need to keep these constants unvarying to keep the experiment accurate. I should already know what measurements to use for my concentrations from preliminary experiments, for example, I know that I have to choose a concentration that changes fairly slowly at room temperature ...read more.

Middle

* The temperatures I have chosen are: * 10�, 20�, 30�, 40�, 50�, 60� * It is virtually impossible to get an exact temperature of, say, 20�, and so, because of this, I will measure the temperature just before the reaction begins and straight after it has finished so that I can get an average temperature to work with. While heating therefore I need to get as close to the desired temperature as possible at the start. * Once my solutions have been heated and equilibrated at the desired temperature I shall pour both solutions into the one beaker while at the same time starting the stop clock. The beaker shall then be put onto a piece of paper with a ":)" written on it. We shall stop the clock as soon as the "(" cannot be seen when looking from above the beaker through the concentration. The temperature shall then be taken down as well as the time taken for it to disappear. * I shall repeat this experiment for my other temperatures only using ice to get my temperatures for 10� and 20�. The whole experiment I then plan to repeat at least once so that I get a wider set of results to compare my investigation with. ...read more.

Conclusion

Evaluation From looking at my results I can tell that my first experiment wasn't as accurate as my repeat experiment. This is because for my repeat I made great care into not mixing apparatus and thoroughly washing out apparatus. Therefore my results should have been better. I think my method was accurate as I kept the experiment in order of temperature and this should have prevented mistakes. Slight alterations could be made to my method which could make it more accurate such as another person could set the stop clock off to make sure that it was started at exactly the same time. Also, we are relying on our eyes to tell us when to stop the experiment because it is when the solution is too cloudy and we cannot se the ":)" anymore. Therefore if we could use an indicator to tell us when to stop the experiment or use another form of checking that the experiment is finished. Overall I think my experiment worked fairly well apart from extreme anomolous results in my first experiment. This however is rectified from my results in the second experiment. Sarah Louise Redmond U5S 07/05/2007 GCSE Chemistry Coursework Investigation 1 of 5 ...read more.

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