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Find out how to change the rate of reaction between sodium thiosulphate and hydrochloric acid.

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Introduction

Year 11 Chemistry Coursework: What Affects the Rate of Reaction? In this investigation I am trying to find out how to change the rate of reaction between sodium thiosulphate and hydrochloric acid. Background Information In this investigation I am investigating with this reaction below: Sodium thiosulphate + Hydrochloric acid � Sodium chloride + Water + Sulphur dioxide + Sulphur Na[2]S[2]O[3(aq) ]+ 2HCl[(aq) ]� 2NaCl[(aq)] + H[2]O[(l) ] + SO[2] + S[(s)] In any chemical reactions, there are number of factors that can affect the rate of reaction, these are listed below. Temperature The atmospheric temperature can affect the temperature of the mixture in a chemical reaction, as the temperature increases, the particles inside the mixture has more kinetic energy to move, therefore, the particles will have more successful collisions with their reactants, thus increasing the rate of reaction (figure 1). Figure 1 (left) - particles vibrates more in higher temperature, giving more successful collisions and faster rate of reaction Figure 2 (right) - more particles in a solution means more chances of successful collisions, therefore faster rate of reaction Concentration Concentration of a solution is the number of particles present in the solution, if there is higher number of particles in a solution, than it will have more chance of successful collisions with its reactants, therefore giving a faster rate of reaction. ...read more.

Middle

Measure the amount of hydrochloric acid required and pour into the beaker with the mixture, when the acid is poured, start the timer 7. When you are not able to see the cross underneath the beaker, stop the timer and record results 8. Clean out beaker and apparatus that has been used for solutions and carry on experiment with another concentration Fair Test and reliability By following my method, I am able to complete the experiment properly; I will need to do the experiment 3 times as I can then calculate the average and give a reasonable and good result and analysis. In also enables me to ignore any anomalous data that I might have due to certain mistakes that might occur during my experiment. In order to keep this a fair test, I may also wish to have separate measuring cylinders and pipettes for each different solution for my experiment, therefore no reaction will take place in these apparatus when I have mixed and used them, thus giving me an accurate experiment rather than causing anomalous results to appear in my experiment. Similarly, I will need to sort out the lids of the solutions to their right solutions as it can contaminate the solutions and giving me a different/anomalous rate of reaction. I might also need to be aware to stop the time watch when I cannot see the cross from the paper completely rather than stopping ...read more.

Conclusion

There also might have been the contamination of solutions in the beaker after it has been washed for the next concentration/experiment, as washing it in the sink caused water to stay in the beaker, I did not dry the beaker for each experiment, therefore, there might have been slight amount of water already in the beaker; affecting the concentration of the solutions and diluting them. This means the results could have been faster overall for each concentration, therefore suggesting that my results cannot completely confirm my prediction. To improve and make my experiment more reliable, I will need to dry my beaker to stop any contamination between solutions, also taking care of the time taken for each reaction by allowing the reaction to completely stop. In order to confirm my prediction and statement about concentration and rate of reaction I may do the experiment again but repeating it more than 3 times with more than 5/6 variables for my concentrations, this will allow me to explore in detail of the rate of reaction and giving me an overall conclusion of how concentration affects rate of reaction. I may also do the experiment with different solutions, so that I can confirm whether the rate of reaction between sodium thiosulphate and hydrochloric acid is the same with other solutions. I may also investigate other factors that affects rate of reaction such as temperature to see which factors affects the most to the rate of reaction. ...read more.

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