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Investigation to find out how the rate of the reaction of hydrochloric acid and sodium thiosulphate solution is affected by the concentration of the sodium thiosulphate

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Introduction

Isobelle Bradley An investigation to find out how the rate of the reaction of hydrochloric acid and sodium thiosulphate solution is affected by the concentration of the sodium thiosulphate. I am going to investigate the effect of varying the concentration of sodium thiosulphate solution in a reaction with hydrochloric acid. The theory behind this experiment is that 'increasing the concentration can increase the rate of the reaction by increasing the rate of molecular collisions.' Sodium Thiosulphate + hydrogen acid sodium chloride + sulphur +sulphur dioxide + water Or Na SO (aq) +2HCL (aq) 2NaCL (aq) + SO (I) + SO (g) Plan Prediction I predict that the greater the concentration of sodium thiosulphate solution the faster the chemical reaction will take place. Therefore, the cross will disappear more quickly due to the cloudiness of the solution. I think that the concentration of a solution effects the rate of reaction because 'the rate of reaction depends on how frequent the particles of the reacting substances collide. ...read more.

Middle

I will do this by using a thermometer to measure each chemical. If the temperature is too high then I will I will put it in cold water. If it is to low I shall put it in hot water. I will have the temperature at 200c * Preliminary experiment I shall use my experiment to find out which quantities to use I decided to use 8 cms of 2 mol hydrochloric acid and a 0.2 mol of sodium thiosulphate. I vary the concentration of my sodium thiosulphate. Results Volume of Sodium Thiosuphate / Volume of Water/ Temperature / Time / s 40 0 22 16 38 2 22 22 28 12 22 34 20 20 22 47 16 24 22 59 8 32 22 175 5 35 22 275 Conclusion I have decided to use exactly the same concentrations and quantities in my investigation except I shall repeat the each experiment 3 times Method I am going to pour 8 cms of 2 mol hydrochloric acid in to my conical flask I am then going to add my concentrations of 0.2mol sodium thiosulphate. ...read more.

Conclusion

As we look at the graph we can clearly see that if you double the concentration you double the rate of reaction. Before I did the experiments I made some predictions they were that the more concentrated the sodium thiosulphate was the quicker the reaction would happen. This was completely correct because what I thought would happen, did. My hypotheses was, an investigation to find out how the rate of the reaction of hydrochloric acid and sodium thiosulphate solution is affected by the concentration of the sodium thiosulphate, and I can now answer this as I have found out that the rate of reaction would increase if I increased the concentration and would decrease if I decreased the concentration. Evaluation My results are fairly accurate as all of the points lie close to the line of best fit and go through the line of origin, however I feel my results could have been more accurate and I could of repeated ach experiment one more time just to be sure. ...read more.

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