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Factors affecting the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid.

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Introduction

Factors affecting the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid Prediction I think the time the cross takes to disappear will decrease as the concentration of sodium thiosulphate increases. This prediction is based on the 'collision theory' and all of the results and analysis will be based on this theory. Apparatus Conical flask, measuring cylinder, stopcock, paper with cross on it, hydrochloric acid, sodium thiosulphate. Method Firstly measure 50cm of 1.0mol/dm sodium thiosulphate solution using the conical flask. Then add 5cm of 2.0mol/dm of hydrochloric acid to the flask containing the sodium thiosulphate. Then place the flask over the cross. Then start the stop clock immediately and time how long it takes for the hydrochloric acid and the sodium thiosulphate to mix. When the cross on the paper completely disappears stop the clock. Repeat the experiment again for 0.2, 0.1, 0.05, 0.025 and 0.0125. To make my experiment a fair one, I will look at a lot of things. Firstly, I will look at the factors that may affect how well the investigation would work and these are things like using different equipment or doing the actual experiment in different conditions i.e. ...read more.

Middle

This clearly shows that when the concentration is greater, an experiment occurs quicker. As the concentration was halved the time taken for it to completely react doubled. As we can see it took 30 seconds for 0.2mol to react and it took 1 minute for 0.1mol to react. The time continues to double as the concentrations are halved. In the results we can see that as the concentration of the solution decreases the time taken for the reaction increases. The times for the reactions increase proportionally as the concentration decreases. The Rate of Reaction varies greatly. Some chemical reactions like explosions happen very quickly while others like rusting take time and happen very slowly. The rate of reaction can be affected by a number of factors: temperature, concentration, pressure, adding a catalyst and surface area . The one that I have investigated is Concentration. The factors that affect the rate of a reaction are called the collision theory. When the concentration is higher there are more particles so the number of successful collisions increases. The minimum energy needed for a successful collision is called the activation energy. ...read more.

Conclusion

As there was less energy the time for the reaction to occur increased. Evaluation I think that this experiment has been completed successfully. My results were accurate as each measurement was checked carefully. There were no anomalous results within my results table and I think this was because of the extreme care that I put into making sure that the experiment was set up correctly with careful measuring. I feel that I should have repeated my results to make sure that the results that I obtained were not incorrect. In the table you can see that for the smaller concentrations of Sodium Thiosulphate, which was mixed with distilled water the molecules were less dense and so the activation energy was not reached as quickly. As there was less energy the time for the reaction to occur increased. Overall, this investigation has been a very successful one. I feel my results and analysis have been as precise and reliable as they could have been under the time given. However I feel with extra time, I could have repeated the experiment and made it even more accurate and adapted it to try other variables for example Temperature or adding a catalyst. This would have furthered my investigation. ...read more.

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