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Does changing the temperature of the acid affect the speed of reaction?

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Introduction

Khalid Shaheen 10F 7.11.00 RATE OF REACTIONS QUESTION Does changing the temperature of the acid affect the speed of reaction? APPARATUS Hydrochloric Acid - 20ml (I will measure it using a measuring cylinder) Flask - to keep the hydraulic acid in it Water Tub - 3 of them with different temperatures (40�C, 45?C, 50�C, 2?C (using ice) room temperature (about 23?C). Clamp stand - to hold the gas cylinder Magnesium Ribbon - 5cm Stop Watch - to time the experiment accurate Gas Syringe - to see how fast the magnesium reacts with the hydraulic acid in ml Thermometer - to check the temperature of the acid inside the flask. DIAGRAM METHOD I will set up my apparatus as shown in the diagram but before I put the magnesium ribbon in it, I will make sure that the acid is exactly at 50�C, and nowhere near 60�C because if it goes higher it might be dangerous or explode. To make sure it stays the same and to make sure it's safe, I will use a water bath. This is like a small tub with water at a certain temperature and when I put the flask with the acid in it, it will make the temperature of the acid stays the same as the water. ...read more.

Middle

2nd time (cm�) 3rd time (cm�) AVERAGE 0 0 0 0 0 10 23 20 7 16.7 20 40 36 32 36 30 52 38 44 44.7 40 59 55 54 56 50 65 63 59 62.3 60 69 66 65 66.7 70 72 73 61 68.7 80 74 77 71 74 90 77 81 73 77 100 80 83 74 79 110 81 87 76 81.3 120 85 90 88 87.7 130 85 90 89 88 Acid at 50�C TIME IN SEC. VOLUME (cm�) 2nd time (cm�) 3rd time (cm�) AVERAGE 0 0 0 0 0 10 24 20 19 21 20 47 45 40 44 30 57 50 47 51.3 40 61 57 53 57 50 71 63 60 64.7 60 76 70 69 71.7 70 78 78 70 75.3 80 78 79 74 77 90 78 80 75 77.7 100 78 80 75 77.7 110 78 80 75 77.7 120 78 80 75 77.7 130 78 80 75 77.7 Acid at 2�C TIME IN SEC. VOLUME (cm�) 2nd time (cm�) 3rd time (cm�) AVERAGE 0 0 0 0 0 10 8 10 10 9.3 20 15 19 15 16.3 30 21 26 21 22.7 40 28 31 27 32 ...read more.

Conclusion

So, I managed to get a more reliable result but not very accurate. I got some anomalous results for the acid being at 45�C because it should react faster than the acid at 40�C because it's hotter and it will have more energy, but it didn't. It was completely the opposite. This might happen because I rushed it through and didn't heat to the exact temperature or it cooled down faster than the acid at 40�C maybe because the air conditioner was put back on again. To improve my investigation I should have extended it and did more experiments to get a good set of results and to be more accurate while doing them. Also, I can improve it by getting all the amount of magnesium ribbon needed and all the hydraulic acid needed, and to use up the time I should put some test tubes in the water bath or in ice to get to the temperature needed while doing another experiment because then I wouldn't have to wait and waste time for the acid to get to the temperature needed. ...read more.

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