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# Experiment to show how concentration affects the rate of reaction

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Introduction

Experiment to show how concentration affects the rate of reaction Prediction I predict that the reaction time will be quicker when the concentration of the acid is more concentrate. This is because when acid is more concentrate there are more particles Thio present to bump into the acid, this is what causes the reaction. Sodium + Hydrochloric Sulphur + Sodium + Water Thiosulphate Acid Dioxide Na S O (aq) + 2HCL (aq) S (s) + 2NaCL + H O Apparatus Sodium Sulphate Hydrochloric acid Water Conical flasks Pipette Stop watch Measuring cylinders Fair Test To make the experiment a fair test we will always use the same amount of Hydrochloric acid in this case 5 cm3. The total amount of Thio solution will always be 50cm3. All the experiments will be carried out at room temperature. We will use the different measuring cylinders for the acid and Thio solution to keep them apart until we start timing. When the acid is added we will swirl it 3 times. ...read more.

Middle

8. Repeat the experiment another 3 times using 20cm3 of Thio, 30cm of water and 5cm3 of acid. Record your results. 9. Lastly do the experiment 3 times using 10cm3 of Thio, 40cm3 of water and 5cm3 of acid. Record the results. 10. Place all results in a table and calculate the average time for each experiment. Concentration of Thio 2m 1.6m 1.2m 0.8m 0.4m Vol. Thio (cm3) 50 40 30 20 10 Vol. Water (cm3) 0 10 20 30 40 Vol. Acid (cm3) 5 5 5 5 5 Ex. 1 time 31.12 38.60 55.84 78.72 207.72 Ex. 2 time 29.84 37.90 54.97 79.43 207.21 Ex. 3 time 30.69 38.37 54.88 80.82 206.27 Average Time 30.55 38.29 55.23 79.67 207.06 NB red writing indicates when a new batch of Thio (sodium sulphate) was used Analysis and Conclusions The more concentrate the solution the quicker the ' X ' disappeared i.e. ...read more.

Conclusion

The graduations on the cylinders were very faint, therefor hard to read accurately. To get rid of this problem we would have to use new equipment which would be far too expensive. For four of the experiments I used a new batch of Thio which could have made a difference, fortunately not in my case. My graphs show that I didn't obtain any anomalous results, so my results must have been accurate. As with any experiments you are going to encounter difficulties, although there were a few I think it was a good procedure and as long as you carry it out slowly and cautiously you will obtain accurate results. I think my results draw a firm conclusion that concentration does affect the rates of reaction, i.e. the more concentrate a solution the faster the rate of reaction. Dilute Solution Concentrate Solution The diagrams above show that in a more concentrate solution there are more particles present. This means that the reaction will take place quicker because the sodium Thiosulphate is able to collide into more particles which makes the reaction happen faster. ...read more.

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