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Reaction of Magnesium and Hydrochloric Acid.

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Chemistry Coursework Reaction of Magnesium and Hydrochloric Acid Initial Tests Before starting the planning the amounts of all the chemicals needed to be tested to see how much needed to be used. So a few Initial tests were done. In them I tested for a suitable amount of acid that should be used. 50cm3 would be best. There was a test for the best amount of Magnesium used and how much gas should be collected each time. It would be best to use 0.06g of Magnesium and to collect 50cm3 of Hydrogen gas. The table below is of our results from these Initial tests. Test Acid 0.5M Mg Gas Collected Time (cm3) (g) (cm3) (sec) 1 50 0.1 20 45 2 50 0.6 20 61 3 50 0.6 50 163 Planning Aim To investigate how temperature affects the rate of reaction between Magnesium and Hydrochloric Acid. Key factors * Rate of Temperature: -Affect on rate increases. * Concentration of Acid: -Higher concentration results to more acid particles, which means more collisions. Affect on rate increases. Lower concentration results to less acid particles, which means fewer collisions. ...read more.


When the acid is heated there is more energy there so the reaction will go faster. Therefore the particles will begin to move around faster and there will be more successful collisions. The rate at which they travel becomes faster. The energy breaks the bonds apart. If the collision has no energy, no reaction occurs. The acid particles will bounce away from the Magnesium particles. The rate of a reaction depends on how many successful collisions there are in a given unit of time. When the acid is heated the particles will take in energy. The collisions, therefore, have more energy, so more of them are successful. Observation Results Table Temperature Actual Average of actual Concentration Amount of Amount of Gas of Acid temperature (0c) temperature of Acid Acid gas collected collected (0c) 1 2 3 (0c) (M) (cm3) (cm3) 10 10 (NO REACTION) 10 0.5 50 50 Hydrogen 30 28 28 33 29.666 0.5 50 50 Hydrogen 50 47 48 50 48.333 0.5 50 50 Hydrogen 70 66 72 70 69.333 0.5 50 50 Hydrogen 90 89 90 94 91 0.5 50 50 Hydrogen Table continued . ...read more.


All the other results met what was expected so I think it may actually have been a human error. I didn't really have problems with anything in the practical, but I could say that I found it hard to make sure that there weren't any air bubbles in the measuring cylinder full of water, whilst I was trying to put it under the water in the tub. That bit was difficult, when I put the measuring cylinder into the water I somehow got some air bubbles in it. I had to do that bit very carefully. The results could have been improved with very minor adjustments, like I could have used a syringe to measure the acid out much more accurately, instead of a measuring cylinder. It would be time consuming but very accurate and precise. I could also have made my results even more accurate by repeating the whole experiment three more times, to make six in total, to get a much better average. I could also have used other methods to calculate how it's affected when the temperature is used as an important variable. I could have used the precipitation method. But I don't think it would be as accurate as the method I used. My results were quite reliable because they were done fairly and very accurately. ...read more.

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