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sodium thiosulphate reacting with hydrochloric acid

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Introduction

Matthew Hawkeswood 11emr Science course work Plan I am going to test the reaction time of sodium thiosulphate reacting with hydrochloric acid with different concentrations of sodium thiosulphate. I will differ the concentration of the solution by adding water to the concentration to make it always at 25 ml for example:- 25ml of sodium thiosulphate with no water and 5ml of 2 moler hydrochloric acid. Equipment that I am going to use Conical flask Sodium thiosulphate Hydrochloric acid Paper and pen Stopwatch Measuring flasks I predict that as the concentration of the sodium thiosulphate decreases that the time for the reaction to take place will increase. ...read more.

Middle

Repeat for other solutions and copy all results in a table Pre work I ran a pre work experiment and these were the results Volume of solution Sodium Thiosulphate:Hydrochloric acid Time 25:0 30 secs 20:5 40 secs 5:20 1 min This pre work proved my theory and therefore made my experiment worthy. As these results show an increase in time occurred when the solution was watered down. Chemical equations Sodium thiosulphate + hydrochloric acid Na2S2O3 (aq) + 2HCl(aq) This gives Sulphur + sodium chloride + sulphur dioxide + water S (s) 2NaCl(aq) SO2(g) H2O Sulphur appears in the form of very small particles of solid. ...read more.

Conclusion

You do this with different concentrations of sodium thiosulphate Results table and graph Solution ST: H2O 1st taking 2nd taking Average 25:0 33.72 secs 30 secs 31.86 secs 20:5 39.63 secs 35.57 secs 37.6 secs 5:20 4.43 mins 4.47 mins 4.45 mins 15:10 52.9 secs 56.94 secs 54.92 secs 12:13 1.20 mins 1.41 mins 1.18 mins 10:15 1.25 mins 1.16 mins 1.33 mins As this graph shows there is an obvious increase in time as the solution is weakened. This is because as the water is added there as less particles of ST for the hydrochloric acid to collide with there fore not causing such a violent reaction. ...read more.

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