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How does temperature affect the rate of reaction between Hydrochloric acid and sodium thiosulphate solution.

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Introduction

Centre number: 49051 Candidate number: How does temperature affect the rate of reaction between Hydrochloric acid and sodium thiosulphate solution Prediction The prediction for this experiment is that when the temperature increases the time taken for the reaction to complete will decrease. I believe this will happen because of the collision theory. This states that when particles have more energy they collide more often and much harder and the reaction occurs at a faster rate. This can be done by increasing the temperature, concentration or surface area and also by adding a catalyst. In this experiment the temperature is the variable factor each time and as it increases the particles gain more energy to collide more often therefore increasing the rate of reaction. Results Starting Temperature (oC) Final Temperature (oC) Time Taken for reaction to complete (seconds) Rate of Reaction 15 16 77 0.012 20 21 45 0.022 Room Temperature (22) 25 32 0.031 30 33 22 0.045 35 37 20 0.05 40 44 13 0.077 45 47 12 0.083 50 52 10 0.1 Analysis These results show that as the temperature increases the rate at which the reaction occurs also increases. ...read more.

Middle

Conclusion From the results and analysis I can therefore conclude that the rate of reaction is affected by temperature and that the collision theory plays a part in this experiment. This is shown by the fact that as the starting temperature increases the time taken decreases, which is explained using the collision theory that with more energy comes more collisions that are harder and therefore an increasing rate of reaction. I can also conclude that the same amount of heat is produced from each test as it is demonstrated after all 8 results. The other point I can also conclude is that between higher temperatures the time difference is much smaller than with lower temperatures as shown on the graph and results table. This happens because of the collision theory and that at lower temperatures there is a greater amount of time taken because of the lack of energy meaning softer and less often collisions and this is even more effective when the temperature is lower and it takes a great deal longer for reactions to complete than at higher temperatures. Evaluation Reliability The results aren't completely reliable because as the experiment went on the boiling tubes had to be cleaned and that means that ...read more.

Conclusion

Any anomalous results from my experiment may have been obtained by a misreading in the temperature on the thermometer. Another reason for any unusual results may have been obtained from the boiling tube not been cleaned thoroughly leaving extra reactants or maybe an accidental over or under adding of hydraulic acid meaning the reaction was too quick or too slow than if the proper amount of 2cm3 was added to the sodium thiosulphate. If the stopwatch was timed wrongly this would also affect the results and be a reason for anomalous results. Improvements The ways in which the experiment could be improved are if there was a greater length of time to do the experiment so a larger range of results could be collected to make the experiment more accurate and reliable. This would lead to more detailed graphs and would help prove that certain patterns exist. Another way would be to have a better method of keeping the temperature constant. This provided a problem during the experiment because it was very difficult to not let the temperature get slightly high or low. If new boiling tubes were used after each experiment this would reduce greatly the chance of mixing thiosulphate with the precipitate of sulphur from the last experiment and a reaction occurring too early. David Macmillan Science 1 Investigation Chemistry 11Q7 SSW ...read more.

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