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To investigate the effect on the rate of reaction when changing the concentration of sodium thiosulphate in the reaction between hydrochloric acid and sodium thiosulphate.

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Introduction

Reaction Rate Investigation: How is the rate affected by concentration? Aim To investigate the effect on the rate of reaction when changing the concentration of sodium thiosulphate in the reaction between hydrochloric acid and sodium thiosulphate. Prediction I predict that as the concentration of sodium thiosulphate increases, so will the rate of reaction. Scientific evidence: As there become more particles to collide with, there will be more reactions at any one time, which will result in more reactions between the two substances. This links to the 'collision theory', as when the concentration of sodium thiosulphate increases, there will be more substrates to collide with. Method * Measure out the correct concentration of sodium thiosulphate and 5cm� of hydrochloric acid (HCl) ...read more.

Middle

right concentration of sodium thiosulphate is measured out * Trying to do all of the experiments within a short period of time so that they are done at the same temperature, because temperature could also affect the rate of reaction. It is necessary that all other variables are kept the same. Safety To ensure that the experiment is kept as safe as possible I will: * Wear goggles * Wash my hands after each experiment because I will be working with an acid. * Put the flask on a flat surface and keep away from the edge. Results Concentrations of Sodium thiosulphate Amount of Hydrochloric acid Time taken (secs) Try 1 Time Taken (secs) ...read more.

Conclusion

The sodium chloride was produced slower which is what made the 'X' disappear in a larger amount of time. The graph also proved this correct. Evaluation Although the experiment gave me the right results, there were certain problems that I encountered. The one major problem was keeping all of the other variables constant. I managed to keep the volume of dilute sodium thiosulphate and hydrochloric acid virtually the same each time but temperature was the hardest to control. It was almost impossible to do all of the experiments at the same temperature, so I had to do them within the shortest time possible and hope that the temperature didn't change too much. If I was to do this experiment again I would do more tries to get a more accurate average and use more concentrations of sodium thiosulphate to get more results on the graph, but this would take more time. ...read more.

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