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Investigating the Rate of Reaction between Sodium Thiosulphate and Hydrochloric Acid.

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Investigating the Rate of Reaction between Sodium Thiosulphate and Hydrochloric Acid Hypothesis: I believe that the resulting graph will like this: * I know that the line will not go through the origin because at 0�C the two chemicals are still liquid therefore they will still react together. * I believe that as the temperature increases the rate of reaction will also increase this coincides with the collision theory which states that as the temperature increases the speed of the particles and the amount of energy they have also increases this causes more collisions to occur and therefore increases the chance of a reaction taking place. * I believe that the rate of reaction will continue to rise this is because there are no other factors to limit the rate of reaction I have also researched this reaction in my 'Chemistry Counts' exercise book and on the internet and the graphs which I found did not level off but instead kept rising. * Once the temperature of the chemicals reaches around 90�C the water will begin to vaporise this will increase the concentration of the chemicals therefore increasing the rate of reaction. * I will not be able to measure the rate of reaction at high temperatures because it is very hard to reproduce very high temps in the laboratory. Apparatus: Pipette Thermometer (accurate to one centigrade) 250ml Beaker Stopwatch (accurate to 1 second) Boiling Tube Wire Gauze Tripod Bunsen burner Paper Plastic Sheet Sodium thiosulphate (4 mole 40g/litre) ...read more.


* After the chemicals reach one hundred degrees the water in the chemicals will begin to evaporate this will increase the concentration of the two chemicals causing the reaction to occur slightly quicker making the results inaccurate so I am unable to extrapolate beyond the range of data because the prediction will be inaccurate. * The results relate to the collision which I have mentioned earlier it states that when reactions occur the particles of the chemicals collide and some of the collisions result in reactions. By increasing the temperature I am providing the particles with more energy this causes them to move around faster and collide with more energy this results with more reactions occurring more often as my results show. Conclusion: Looking at my results it is clear that as the temperature increases the rate of reaction also increases. The graph also becomes steeper as the temperature increases this is because the increase in the rate of reaction rises. However it does not rise proportionality to the temperature. My hypothesis was correct. Evaluation I believe the data which I obtained in the experiment is reliable because I have taken a number of steps to increase the accuracy and reliability of my results. I have used pipettes instead of measuring cylinders to increase the accuracy of the amount of substances measured out and I have also increased the accuracy of the temperature reading taken as well. I believe that the evidence obtained is sufficient to support the conclusion that as the temperature increases the rate of reactions also increases. ...read more.


If a boiling tube had a delivery tube connected to it the chemicals could be poured in and the gas would be bubbled into a burette. This would also allow the chemicals to be constantly heated easily. Despite all of these flaws in the experiment I still believe that the results do support my conclusion and that the graph itself is relatively accurate. The one anomaly which occurred can easily be accounted for and I do heavily believe if that reading was retaken it would fit with the trend of the rest of the data. Further work to investigate the rate of reaction could be to test the other factors which affect the collision theory. Experiments could be carried out to see how greatly pressure affects the rate of reaction; the same two chemicals would be put under different pressures and the time for the cross to disappear taken. Or possible the concentration of the chemicals could be increased this would cause there to be more particles in the chemicals and therefore more collisions occurring. The rate of reactions of 1-5 mole chemicals could be taken and this would give an idea of how concentration will also affect the rate of reaction. Another possible extension would be to use different chemicals in the reaction instead of sodium thiosulphate; potassium thiosulphate would be used after this evidence is obtained the two for sodium thiosulphate could then be compared with the graph of potassium thiosulphate. Instead of these extensions other acids could be used nitric and sulphuric acid could be used in the same experiment and then the graphs obtained would be compared. ...read more.

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