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Investigation on reacting sodium thiosulphate with hydrochloric acid.

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Introduction

Investigation on reacting sodium thiosulphate Charlie Lovell with hydrochloric acid. I am going to investigate the effect of varying the concentration of sodium thiosulphate, when reacted with dilute hydrochloric acid, on the rate of reaction. I predict that if I increase the concentration of sodium thiosulphate, the rate of reaction will increase, decreasing the reaction time. This is because increasing the concentration of thiosulphate will mean there is more chance of collisions between it and the hydrochloric acid per minute, which will decrease the reaction time, and increase the rate of reaction. I also predict that if I double the concentration of sodium thiosulphate, the rate of reaction will double, therefore halving the reaction time. This is because doubling the concentration of thiosulphate means there is twice as much thiosulphate to collide with the acid, which doubles the amount collisions happening between the two per minute, thus halving the reaction time, and doubling the rate of reaction. There are some variables that I will have to keep constant throughout the whole experiment in order to keep it a fair test. The first variable to keep constant is the temperature. To do this I will do the all the experiments on the same day without opening any windows, or turning on electrical heaters. The next variable to keep constant is the concentration of hydrochloric acid. ...read more.

Middle

The final list of concentrations I will use is: - Sodium Thiosulphate cm^3 Water cm^3 Concentration 100 0 0.15 molar 80 20 0.12 molar 60 40 0.09 molar 40 60 0.06 molar 20 80 0.03 molar Analysis By examining my graph, I can see that the more concentrated sodium thiosulphate is, the faster it will react with hydrochloric acid. This is because increasing the concentration of thiosulphate will mean there is more chance of collisions between it and the hydrochloric acid. By examining the graph I can conclude that my qualitative prediction was correct. Increasing the concentration of sodium thiosulphate does decrease the reaction time. When the concentration of thiosulphate was 0.03 molar the reaction time was 160 seconds. When I increased the concentration of thiosulphate to 0.15 molar, the reaction time decreased to 25 seconds. By examining the graph, I can also conclude that my quantitative prediction was correct. Doubling the concentration of sodium thiosulphate does halve the reaction time. When the concentration of thiosulphate was 0.06 molar, the reaction time was 69 seconds. When I doubled the concentration of thiosulphate to 0.12 molar, the reaction time halved to 34 seconds. Evaluation I believe that the experiment worked well because it gave results that were consistent with each other, and were reproducible. I also believe that my results were of a high quality because I received no anomalous results. ...read more.

Conclusion

I would choose 0.75 molar which is 50cm^3 of water and 50cm^3 of sodium thiosulphate. 2) Decide what temperatures to use; barring in mind that the previous experiment was performed at about 20�C, it would be a good idea for this temperature to be the lower bound of the experiment. About five temperatures will be needed to give results of any meaning, so I would probably go up in steps of 10�C from 20�C. 3) Preheat the water bath to the first temperature. 4) Draw a cross with a marker pen on the bottom of a conical flask. 5) Measure out the chosen amount of sodium thiosulphate using a burette, into the conical flask. 6) Measure out the chosen amount of water using a burette, into the conical flask. 7) Measure out 10cm^3 of hydrochloric acid and place into small beaker. 8) Place the conical flask into the water bath, and place the thermometer into the conical flask. 9) Wait until the thermometer reads the chosen temperature and take the thermometer out of the conical flask 10) Pour the hydrochloric acid into the conical flask and start the stopwatch. 11) Wait until the cross is no longer visible through the bottom of the flask, and stop the stopwatch. 12) Repeat this experiment twice. 13) Change the water bath to your next chosen temperature and repeat steps 5-13 until you have results for 5 temperatures. ...read more.

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