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Investigating the rate of reaction of Sodium Thiosulphate and Hydrochloric Acid

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Planning. I predict that the higher the concentration then the faster the reaction, this is because when water is added the sodium thiosulphate solution and the hydrochloric acid have a more neutral pH and it becomes more dilute then it will be less reactive will the other particles in the solution. Equation for my experiment: Sodium thiosulphate + Hydrochloric acid Sulphur + Sodium chloride Sulphur dioxide Water Na2 S2 O2 + 2HCl 2Na Cl + SO2 + H2O + S The apparatus needed include: Goggles 3 Measuring cylinders (1 to measure sodium thiosulphate, another to measure hydrochloric acid and another for water) 1Beakers A piece of paper or tile with a dark cross-marked on it A stopwatch The materials needed: Hydrochloric acid Sodium thiosulphate solution Water The only variable will be the volume of sodium thiosulphate. The thing I will not change is the volume of hydrochloric acid. I will measure the speed of reaction by timing it using a fairly reliable stopwatch to a hundredth of a second. ...read more.


Then once I am really sure that the cross has disappeared from the sulphur clouding up, I will stop timing and then record the results. For the remaining number of tests I will do exactly the same, but I will increase the amount of Sodium of thiosulphate but add and increase the volume of water. And record all the results into a table. Water Volume of Sodium Thiosulphate solution (ml) Volume of Hydrochloric acid (ml) Time (minutes and seconds) Average Experiment 1 Experiment 2 0 50 5 53.28 secs 59.04 secs 56.5secs 10 40 5 1 min 12.62 secs 1 min 24.07 secs 1 min 16.5 secs 20 30 5 1 min 42,09 secs 1 min 40.92 secs 1min 41.5 secs 30 20 5 3 min 06.9 secs 2 min 37.80 secs 2 min 52.5 secs 40 10 5 3 min 36.28 secs 3 min 52.28 secs 3 min 44 secs I didn't make any major or minor changes from my plan in the beginning, I stuck to the structure of my plan so it was much easier to do the final experiment. ...read more.


The curve sloped downwards. When the sodium thiosulphate solution and the hydrochloric acid were poured into the beaker the sulphur clouded up very quickly, the table and graph shows that both experiments they clouded up under a minute. But when the water is added and the hydrochloric acid and sodium thiosulphate solution became dilute and the reaction slowed down. I think my results were fairly reliable, because I used the apparatus that were quite basic and easy to use. So I think my results are quite accurate as I measured the liquids in millilitres and the time in minutes and to the closest hundredth of a second. All the results fit the same pattern and sloped down the same way. If f I were to repeat the experiment then I would like to use computerised apparatus so the results are more accurate. A computer could time it more accurately and start timing straight away and stop when the cross wasn't visible. To extend this work I can plan to experiment how fast the reaction is under different temperatures. ...read more.

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