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What factors change the rate of reaction between marble chips and hydrochloric acid.

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Introduction

Aim I am going to investigate what factors change the rate of reaction between marble chips and hydrochloric acid. Prediction I predict that the more marble chips there are, the faster the rate of reaction, because there is more marble for the hydrochloric acid to react with, I predict this because in previous experiments when working with the same equipment I found that if you put a lot of marble in the acid, the levels of water in the burette go down very quickly, compared to when you only put a little bit of marble in the acid and the levels of water go down much slower. I also predict that the hotter the temperature of acid, the faster the rate of reaction, because heat often works as a catalyst in experiments with acid. Increasing the temperature of the acid will increase the rate of reaction because particles move faster and collide more vigourously at higher temperatures. Plan I will fill a burette with water, and then turn it upside down in a beaker full of water. I will then put a tube into the bottom of the burette and attach it to another beaker using a bung to stop any air from leaking. I will then calculate the rate of reaction between the marble chips and hydrochloric acid by measuring how much the levels of water in cm� drops every 10seconds. ...read more.

Middle

11.4 500 11.1 510 10.9 520 10.6 530 10.3 540 10 550 9.5 560 9.2 570 8.8 580 8.5 590 8.1 600 8 610 7.5 620 7.4 630 7 640 6.6 650 6.5 660 6 670 5.9 680 5.5 690 5.5 700 5.1 710 5 720 4.7 730 4.5 740 4.4 750 4.1 760 4 770 3.7 780 3.7 790 3.5 800 3.3 810 3.3 820 3 830 2.9 840 2.4 850 2.3 860 2.2 870 2.2 880 1.9 890 1.8 900 1.8 910 1.5 920 1.3 930 1.1 940 1.1 950 0.8 960 0.5 970 0.1 980 0 The rate of reaction for 0.5g marble chips at room temperature. Time (seconds) Level of water in burette (cm� ) 0 50 50 50 10 49.5 49.4 49 20 49.5 48 48.75 30 49.5 46 47.75 40 49 43.6 46.3 50 47.6 41.4 44.5 60 46.2 39.3 42.75 70 44.6 36.9 40.75 80 42.5 33.4 37.95 90 40.2 32.1 36.15 100 39.7 29.6 34.65 110 36.8 27.4 32.1 120 34.5 25 29.75 130 32.1 23 27.55 140 29.9 20.6 25.25 150 27.6 18.2 22.9 160 25.2 16.4 20.8 170 23.4 12.2 17.8 180 21.1 9.8 15.45 190 18.1 7.9 13 200 16 6 11 210 13.9 4.1 9 220 11.7 2.2 6.95 230 9.8 0.2 5 240 7.2 0 3.6 250 5 2.5 260 2.1 1.05 270 0.8 0.4 280 0 0 The rate of reaction for 1g marble chips at room temperature. ...read more.

Conclusion

I chose these times because at about these times the experiment was well underway, so the rate would be accurate, and it wouldn't be too late that the reaction was slowing down. I worked out that the rates were: 45/60 = 0.75 cm/s 40/60= 0.6�cm/s 39/60= 0.65 cm/s 23/40= 0.575 cm/s 24/40= 0.6 cm/s Evaluation I think that the experiment went quite well overall, and we got some quite good results. I think if I did it again I would work with a weight of crushed marble chips instead of just a set weight of random sized marble chips, because the larger the surface area of something, the shorter length of time it takes to dissolve, and this could have effected the results of these experiments because the reactions that took longer may have taken longer because the marble was smaller in surface area than in other experiments. This is because the larger the surface area, the more particles that are in contact with the acid at any one time, so it will be able to react faster. I might also use different strengths of acid to see whether the stronger the acid is, the faster the rate of reaction. A stronger concentration of acid will increase the rate of reaction, because more collisions of molecules are possible in the same amount of time, because there are more particles available in the same volume of acid. ...read more.

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