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Investigating the Reaction between Sodium Thiosuluphate and Hydrochloric Acid

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Introduction

Investigating the Reaction between Sodium Thiosuluphate and Hydrochloric Acid Name: Dilara Yurtmen Group: 10DA Teacher: R.Shore Cand.no: 9198 Centre.no: 30285 P O A E The Reaction Sodium + Hydrogen Sodium + Sulphur + Water + Sulphur Thiosulphate Chloride Chloride Dioxide Na2S2O3(aq) + 2HCI (aq) 2NaCI (aq) + S(s) + H2O + SO2(s) Aim The aim of this experiment is to find out how different variables and changes can affect the reaction time between the reactants, Sodium Thiosulpahte- Na2 S2O3(aq) and Hydrochloric Acid- 2HCI ( aq). The Reaction Sodium + Hydrogen Sodium + Sulphur + Water + Sulphur Thiosulphate Chloride Chloride Dioxide Na2S2O3(aq) + 2HCI (aq) 2NaCI (aq) + S(s) + H2O + SO2(s) Variables The variables I could use to see how they affect the reaction rate of the reactants are: * Temperature * Concentration * Surface Area * Catalyst If I change any of these variables, everything else must be kept constant to be a fair test. Fair Testing For the experiment to be fair, I must consider the following things: * Using the same equipment for each experiment. * Changing the same variable, but keeping the rest constant. * Doing the same experiment 3 times to take and average result. * When using different substances, the equipment used must be washed out properly so that there is not a mix of substances in the experiment. ...read more.

Middle

Temperature One variable I have chosen to investigate is temperature. I will change the temperature of the reactants, but keep the concentration the same. Keeping the concentration constant will make the experiment a fair test, as only one variable should be changed each time. Factor Explanation on grounds of Rate of Reaction Kinetic Theory Collision Theory Temp Increase Particles move faster at higher temperatures Faster Particles collide more frequently with more force. Increase Concentration The second variable I have decided to experiment with is concentration. While experimenting with concentration I must have a constant temperature present throughout, that does not change for a fair test and because only one variable can be changed at a time. Factor Explanation on grounds of Rate of Reaction Kinetic Theory Collision Theory Concentration Increase Particles are closer Close proximity increases collision rate. Increase Obtaining Evidence Here are the results of my experiment: * The first variable I decided to change was temperature. I picked a suitable range of measurements to obtain my results from. I recorded the results every 10 oC temp rise from 10 oC to 80 oC and recorded them in a table. The volume of Sodium Thiosulphate and HCl were kept at a constant volume of 100cm throughout this experiment, as we must only change one variable at a time for a fair test. Temp ( oC ) Run 1 (secs) Run 2 (secs) Run 3 (secs) ...read more.

Conclusion

Evaluation Overall, I think that my experiment went quite well and was quite reliable although there were some things that I could have changed to make the experiment more reliable and accurate. One point was that when watching the X board to see when the cross had disappeared, I took my eyes off it several times and so may not have spotted when exactly the cross disappeared, and looking at it from different angles and distances could have given me wrong results. To make the experiment more accurate I would always keep my eye on the cross from the same place each time and not look away until the cross disappears. When viewing my results, I found one anomalous result, which I didn't include, in my average graph. This made the curve of the graph a lot smoother, making it much easier to draw a line of best fit. To get more evidence and have a wider range of results I could repeat each experiment several times. This would give me more results and could also be more accurate. To extend the experiment I could think about using a different range of concentrations to use. For example instead of keeping with increasing the concentration of Sodium Thiosulphate 5 g/dm3, I could increase the concentration by 1 g/dm3 for much more accurate results. Same for the temperature experiment, I could use a wider range of temperatures to collect results from, which would give me a wider range and more accurate results. Dilara Yurtmen ...read more.

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