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How will the temperature affect the rate of reaction with sodium thiosulphite and ntric acid?

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HOW WILL THE TEMPERATURE AFFECT THE RATE OF REACTION WITH SODIUM THIOSULPHITE AND NITRIC ACID? Andr( Marques Mr Murphy 4-6 5/2/03 Planning Aim The aim of this investigation is to find out and observe how the temperature affects the rate of reaction. I am going to investigate the rate at which the solutions of nitric acid (HNO() and sodium thiosulphate (Na(S(O() turn cloudy (when mixed together), when the temperature is changed. Variables In this investigation I will only have one variable: * The temperature of both solutions (sodium thiosulphate and Nitric acid), so that I will be able to see the affect of temperature on the rate of reaction. The temperature will be measured in Celsius. Fair Test In this investigation I will keep the following constant: * The volume of sodium thiosulphate, at 20cm( (16gl), so that the results will be consistent; * The volume of nitric acid, at 5cm(, so that the results will be consistent; * The volume of water, at 30cm(, so that the results will be consistent; * The same apparatus all the time, so that human error can help to be ruled out; and * The same crossed paper for each test, so that a fainter or bolder cross won't be used. If that happened then the results won't be consistent. Another way in which I will keep this a fair test is by repeating the experiment 3 time for each temperature. I will also carry out the experiment indoors (with the lights on at all time during the experiment), so that the weather won't effect the temperature of the experiment. ...read more.


Then I would have to re-measure the solutions and heat them up. That would be very time consuming. After that, I will measure 5cm( of nitric acid and pour it into an empty boiling tube, which I will then place in a test tube rack. I will also measure 20cm( of sodium thiosulphate and 30cm( of water. I will pour them both into an empty boiling tube (these two together will not react) and place the boiling tube into the same rack, as the one with the nitric acid. I will also place a thermometer in one of the boiling tubes. Then I will place the rack into the water bath, which will have already been heated up to 40(C. I will leave the 2 solutions to rise to a temperature of 40(C, for about 5 minutes. Meanwhile, I will get the stopwatch and the conical flask ready. I will also marked a black cross on a spare piece of paper, so that the reaction (which will take place in the cronical flask) can be position on top of it. Afterwards, I will take the two boiling tube out and pour them both into a cronical flask, which will have already been placed onto of a black cross, and time the reaction as soon as the last drop is added to the mixture. When the black cross is obscured, I will stop timing and record the time in the table, which I will have already draw up. I will repeat this experiment another 2 times. I will also do exactly the same thing with 30(C, and 50(C, but when I do 20(C I will need changed the water bath to a beaker filled with cold water. ...read more.


I know this because I received two anomalies results. You can see these anomalies results below my table of results. But I managed to overcome these two results by redoing the specific temperature. I believe that I did get a suitable range of results for this experiment. I recorded results from temperatures of 20(C, 30(C, 40(C, and 50(C and I think that this is a very good range to see how temperature affects the rate of reaction. However, I feel that this also reduced the chance of knowing if anything changes, if the temperature reaches a certain point. Perhaps doing the temperature even higher or lower would improve my results but this is also quite dangerous, because I could get burnt, so I cannot really say that I could have improved the range of my results. Other investigations I could do to help support my conclusion, which are similar to this experiment are: * Change in mass. Any reaction that produces a gas, when a solid is put into a solution, changes the solid's mass, which can be easily measured on a mass balance. * The volume of gas given off. This methods uses a syringe to measure the volume of gas given off. Overall, this investigation has been a very successful one. I feel my results were quite consistent and that my analysis was very accurate, under the time allocated. However I feel with extra time, I could of extend this investigation by experimenting with more temperatures, and also having different variables i.e. concentration of the acid or adding catalysts. For example: I could have 30cm( of sodium thiosuphate, 20cm( of water and 10cm( of nitric acid. Or I could of used hydrogen peroxide instead ?? ?? ?? ?? ...read more.

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