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rate of reaction

Extracts from this document...

Introduction

Results of Rates of Reaction Experiments: Throughout the experiments, I used 2 molar hydrochloric acid and 1gram of medium sized marble chips. This was to keep the tests fair. I varied the concentration of he hydrochloric acid by combining different amounts of water with different amounts of hydrochloric acid to decrease the molarity but keep the same amount of liquid in the equation. 10ml acid with 0ml water Time 1st result 2nd result 3rd result 20 0 0 0 40 1 2 4 60 8 4 9 80 11 6 12 100 14 9 15 120 16 12 18 140 18 15 19 160 20 15 21 180 22 18 24 200 25 18 24 220 28 21 24 240 28 22 260 28 22 280 25 300 25 320 25 9ml acid with 1ml water Time 1st result 2nd result 3rd result 20 8 13 12 40 16 22 17 60 22 29 22 80 24 38 27 100 28 44 31 120 35 50 35 140 39 55 40 160 40 60 43 180 50 70 46 200 62 73 50 220 73 76 52 240 77 78 53 260 83 82 57 280 ...read more.

Middle

3 40 2.3 18.3 3.6 9 0.3 5 60 7 24.3 6.3 13.3 2 7.5 80 9.6 29.6 8.6 16.3 2.6 9 100 12.6 34.3 10.3 18.3 3.3 11 120 15.3 40 13 23.6 4.3 12.5 140 17.3 44.6 15 25 5 14.5 160 18 47.6 16.6 27.6 6 16 180 21.3 57.3 18 27.6 6 17 200 22.3 61.6 19.3 27.6 6 18 220 24.3 67 21 19.5 240 25 69.3 22 20.5 260 25 74 22 22 280 25 76.6 22 23 300 25 79 23.5 320 25 81.3 30 340 83 30 360 85 380 86.6 400 87.6 420 89 440 84 460 85 480 78 500 79 520 83 540 83 560 83 Conclusion: From analysis of the results I have recorded, I have come to the conclusion that the rate of reaction gets slower when the concentration of acid is weakened. This is proven by the graphs showing my data. This proves my prediction about the particle theory. I stated that when concentration was increased, the rate of reaction increased because the amount of particles increases but the surface area stays the same so the particles are closer together and therefore have more collisions. ...read more.

Conclusion

The results for 50%, 80% and 100% were anomalous because 100% was below 90% and 70% while 50% was the lowest result, lower than 30% and also, 80% was lower than 80%. But it could also be seen as 30%, 70%, and 100% being anomalous because 30% is higher than 50%, 70% is higher than 80% and 100% and 100% is lower than 70% and 90%. So in comparison to reach a final result, it is impossible to define which result/results were anomalous except I came to the conclusion that 100% is anomalous. . Looking back on when I performed the experiments, I have realised that I obtained the results of each variable on different days so I came to the conclusion that we may have used different equipment each day which caused the range in results. I am quite sure that it was the gas syringe that was faulty but that is the only reasonable explanation I can think of. . I received plenty of results to come to a conclusion and if I could do it again, I would do more variables and test each variable one or two more times so that I can pick out the best three for each variable. That would give me a more consistent result. ...read more.

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