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How Does the Temperature of Hydrochloric Acid Affect the Rate of Reaction Between Hydrochloric Acid and Magnesium?

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Introduction

How does the temperature of hydrochloric acid affect the rate of reaction between hydrochloric acid and magnesium? Aim: This coursework is aimed to find out the rate of reaction between hydrochloric acid and magnesium in different temperature. The product of this chemical reaction is magnesium chloride and hydrogen. Safety: We should wear lap coat and wear goggles when doing this experiment, because acid is corrosive and irritant, especially when you boil it, it is very easy to spit into your eyes and it is harmful, so we must keep wearing on the goggles all the time. Lap coat is also needed to protect our skin from contacting the acid. If our skin contact with the acid, we should immediately wash it under the tab water. Magnesium is highly flammable, so we should keep it away from the fire. We should also be careful when using the syringe and other glassware. Preliminary work: In this preliminary work, the aim is to find out the suitable length of magnesium ribbon, the suitable concentration of acid and the suitable volume of the acid, and the temperature range I plan to investigate. I tried a 3 of magnesium ribbon but it gives out too little gas (35) which is very hard to measure and 7 are too long, due to magnesium's mass, it is lighter than acid, so it is floating on the acid which means it's surface area are not all contacting with the acid, which makes the test unfair, so I figure out 5of the magnesium ribbon, (gives out about 55of hydrogen) ...read more.

Middle

25 75 29 32 30.5 90 35 38 36.5 105 40 43 41.5 120 45 46 45.5 135 48 47 47.5 150 50 51 50.5 Rate of hydrogen given out every 15 secs at 25?C Time /sec Volume of hydrogen given out / experiment 1 experiment 2 Average 15 10 11 10.5 30 19 20 19.5 45 28 29 28.5 60 36 38 37 75 43 45 44 90 48 50 49 105 49 50 49.5 Rate of hydrogen given out every 10 secs at 30?C Time /sec Volume of hydrogen given out / experiment 1 experiment 2 Average 10 9 10 9.5 20 16 18 17 30 26 27 26.5 40 33 37 35 50 42 45 43.5 60 47 49 48 70 50 49 49.5 Rate of hydrogen given out every 10 secs at 35?C Time /sec Volume of hydrogen given out / experiment 1 experiment 2 Average 10 12 11 11.5 20 24 20 22 30 33 31 32 40 42 40 41 50 49 46 47.5 60 50 49 49.5 Rate of hydrogen given out every 5 secs at 40?C Time /sec Volume of hydrogen given out / experiment 1 Experiment 2 Average 5 10 9 9.5 10 16 15 15.5 15 22 20 21 20 28 27 27.5 25 33 30 31.5 30 38 38 38 35 43 45 44 40 47 49 48 45 50 51 50.5 50 51 51 51 Rate of hydrogen given out every 5 secs at 45?C Time /sec ...read more.

Conclusion

Thirdly, the concentration may not be a constant as the dilute acid's concentration may not be the same when they are given to me .Human eyes are not reliable for accurate measurement, so the ratio of water and acid may varies when I use a measuring cylinder to measure the acid and the water. The acid which is heated may evaporate a bit. These are very hard to improve as human eyes cannot look at things very accurately, also I can just keep the temperature as low as possible to avoid the acid evaporate. Fourthly, the magnesium is always floating on the acid , which varies the contact surface area of the acid with the magnesium and it makes the result inaccurate. Lastly, the reading of the thermometer and the volume of gas syringe may not be very accurate, as I have said , human eyes are not very reliable. Although there is lots of area, I still did all my best to keep the result more reliable and there are several things I can improve. I should measure the volume of hydrogen gas given out in a smaller range which can make the graphs more reliable and accurate, and I should do the experiment several more times and calculate out the average which can make my results more reliable and I should work in group of about three, which can keep the varieties as less as possible and make the experiment more accurate. ?? ?? ?? ?? Chris Chan 2 1 ...read more.

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