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"What Affects How Quickly Sodium Thiosulphate (thio) Goes Cloudy?"

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"What Affects How Quickly Sodium Thiosulphate (thio) Goes Cloudy?" Skill P - Planning Concentration can change the speed of the reaction in two ways: * The higher the concentration of the thio, the faster the rate of reaction, and the shorter the time span. * The lower the concentration of the thio, the slower the rate of reaction, and the longer the time span. I will be using first-hand experience evidence, as it will be a more reliable investigation, if I were to use secondary sources, the results may not be accurate enough to analyse. I will record my data in a table and then plot it onto a graph; I will use a wide range of equipment. For my experiment, I will use the 'disappearing cross' method. To allow me to make this test a fair test, I will use the same cross for all the tests. The disappearing cross method is whereby I have a cross drawn on a piece of card, and is laminated, (to help stop the liquid solution from damaging the card). The cross is placed under the conical flask. As the reaction takes place, the solution becomes cloudy and the cross gradually disappears. Being as I am using Hydrochloric Acid and Sodium Thiosulphate, I must ensure that I have protection from the liquids; therefore I will wear goggles. In order to make my experiment an accurate experiment, I will observe the cross and wait for it to disappear. ...read more.


By doing this, I will not be allowing any pre-reacted substances into the experiment. Using a laminated cross allows me to use it over and over again as it would not be affected by any liquids falling onto it. I will take 10 readings initially, however, any results that are not close to the line of best fit, I will redo. I will record my results in a table, after recording the results into a table; I will transfer them into a graph. My results will be reliable, as I will have made all the experiments a fair test, the only thing that would be beyond my control would be the temperature of the room, and this may vary my results slightly. Skill O- Obtaining evidence Test Volume of thio (cm�) Volume of Water (cm�) Volume of Hydrochloric Acid (cm�) Time Taken (secs) Temperature (�C) Concentration of thio (M) 1 25 0 10 8.97 25 1 2 22 3 10 12.82 21.2 0.88 3 20 5 10 11.62 25 0.8 4 17 8 10 16.99 20.5 0.68 5 15 10 10 19.15 22 0.6 6 12 13 10 19.20 24.5 0.48 7 10 15 10 26.31 22 0.4 8 7 18 10 32.87 25.5 0.28 9 5 20 10 40.87 22 0.2 10 2 23 10 77.19 24.5 0.08 Here are the results to my experiment. I had done 10 preliminary tests to see if the results would fit on my line of best fit appropriately. ...read more.


the solution, the results are not very accurate as the temperature of the room varied from time-to-time, therefore, I could not ensure that the test was done very accurately. My results are reliable in the sense that they all follow my prediction, all of my data points fit nicely on the line of best fit. At the same time, my results are not very reliable as I only performed the investigation once, I didn't find an average, and the results could have been fluke. In order to obtain my results, I could have used the help of ICT. Programs such as Focus could have enabled me to work out more accurate timings/results. I could have used a computer animated program to show me when the cross disappeared, and I could have had had it done at a certain temperature; this would have enabled me into getting accurate answers and I would have no need to perform the investigation several times. Being as I did the investigation manually, I drew the graphs and other things on the computer, this would give me an accurate graph. I drew the line of best fit manually as it would allow me to make my own analysis and allow me to give the best possible answers. I could have done the investigation in different ways: * Changed only the temperature of the solution * Not added distilled water but change the amount of thio I mix with hydrochloric acid. * Changed the strength of acid and the thio. May 07 ...read more.

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