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# An Investigation Into the Effect of Concentration on the Rate of Reaction

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Introduction

An Investigation Into the Effect of Concentration on the Rate of Reaction Aim: I am going to investigate the effect of changing the concentration of a solution on the rate of reaction. I think that the more concentrated the reactants, the greater the rate of reaction will be, because if the concentration of the reactants increased the number of collisions between the molecules would also increase and thus the rate of reaction would increase as well. Weaker solutions have fewer molecules; there would be fewer collisions so the rate of reaction would go down. You would expect a faster reaction to take less time. The temperature in the experiment will be kept constant right the way through the experiment because for a fair test only one quantity changes at a time. Reaction Sodium + Hydrochloric Sodium + Sulphur + Water + Sulphur thiosulphate acid Chloride Dioxide Or NA2 S2 O3 (AQ) + 2HCL(AQ) 2NACL (AQ) + S(S) ...read more.

Middle

The temperature will stay constant right the way through the experiment to make the experiment a fair test. (Only one variable changes at one time) Also I will keep the amount of acid the same, I will use the same cross and I will repeat the experiment at least three times. During the experiment, I wont use a catalyst and I am using solutions so particle size wont matter. The total volume of the solution will stay the same at all times. Results Table Thio (mm) Water (mm) Acid (mm) ------------ Time -minutes ------------ Average- minutes Seconds Experiment 1 Experiment 2 Experiment 3 5 45 5 7.01 14.30 5.10 8.08 488 10 40 5 2.13 3.27 3.34 3.07 184 15 35 5 2.42 2.13 1.56 2.04 124 20 30 5 1.20 1.20 1.16 1.13 73 25 25 5 1.03 1.05 1.18 1.09 69 30 20 5 57 52 57 55 55 Analysis I have got three sets of ...read more.

Conclusion

The reason, as I said in my prediction is collision theory. The more concentrated the solution the more molecules it has which means there is more chance of a collision and therefore a reaction. Volume of Thio(mm) Time(s) 1/Time 5 488 0.002 10 184 0.005 15 124 0.008 20 73 0.013 25 69 0.014 30 55 0.018 I have produced this graph and it proves that the concentration of thio is directly proportional to the reciprocal (1/t) of time taken. It is much easier to see the relationship between the thio and the variables plotted on a straight line graph than on a hyperbola. Evaluation My experiment worked quite well I think. I had one anomaly, which I have highlighted on both of my graphs. This was probably due to my measuring out not being accurate enough. I think to make it more accurate maybe I could have used a Burette. I got three sets of results; my experiment probably would have been more accurate if I had collected more results. Peter Whittle ...read more.

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