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Investigating the effect of changing the concentration on the rate of reaction.

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Introduction

Course Work - Chemistry Investigating the effect of changing the concentration on the rate of reaction Plan I am going to investigate the effect of changing the concentration of sodium thiosulphate on the rate of reaction. sodium hydrochloric sodium water sulphur sulphur thiosulphate + acid (aq) + (l) + (l) + dioxide (aq) (aq) (g) Na2 S2 O3 + 2HCL 2NaCl + H2O + S + SO2 I have done previous work on this investigation, in class & from past preliminary work. In my preliminary work we have done a similar experiment, but to find out what effect temperature had on the rate of reaction between sodium thiosulphate, hydrochloric acid & water. We used this past experiment for the basis of this experiment to find out what effect concentration had on the rate of reaction. Prediction I predict that if I increase the concentration of sodium thiosulphate the rate of reaction will increase. This is because increasing the concentration of sodium thiosulphate will increase the volume of acid particles & increase the chance or frequency of collisions between the particles & therefore increase the rate of reaction. ...read more.

Middle

I will also use the same measuring cylinders- as the measurements might be slightly different & I will make sure the experiment is done in the same place & amount of light each time. Safe Test To make the experiment a safe test, will be wearing safety glasses at all times, we will be sensible when using & handling equipment especially glass & when using chemicals or acids which may be irritant. We will behave sensibly & be responsible when in the lab (not running or causing problems for others), making no excessive noise & behaving appropriately. Method To carry out the experiment I am going to record the time taken for different amounts of sodium thiosulphate & hydrochloric acid to react to form sulphur. I am going to do this by using glass beakers & a card with a black cross on it. I will time the rate of the reaction while looking down through the beaker until the solution is too murky to see the cross. ...read more.

Conclusion

Its shows that as the concentration of sodium thiosulphate increases the rate of reaction also increases. I was correct in my prediction as supported by the evidence shown in the graph. Evaluation I only encounted two problems whilst conducting the experiments. When running more than one experiment at any one time, the crosses were not exactly the same as we were limited to the sane size crosses. Also when doing the experiments, people saw the cross fade completely at slightly different times, so next time we would use the same person to record the time for the cross to fade out completely. Our results were quite accurate, to make sure sure we repeated them & took an average. We also compared results with other students which our results compared by at most ten seconds. The method we used was efficient for what we wanted to find out. The results we got out of the experiment are reliable, in the repeated results, the results also only compared by around 0- 10 seconds. ...read more.

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