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Experiment To Investigate How Fast Different Concentrations Of Acid React With Magnesium.

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Tasneem Husain Experiment To Investigate How Fast Different Concentrations Of Acid React With Magnesium Aim I am investigating how changing the concentration of acid affects the rate of reaction between magnesium and hydrochloric acid. Mg + 2HCl MgCl2 + H2 Magnesium + Hydrochloric Acid (2 parts) Magnesium Chloride + Hydrogen Scientific Knowledge In our lessons we have been learning about how and why the rate of reaction changes. The 'rate of reaction' is the speed that a reaction takes. The factors that affect the rate of reaction are concentration, surface area and temperature. The concentration of a substance is the number of particles in a certain volume of substance. We know that the more concentrated the solvent, the faster the rate of reaction. This is because the more concentrated the solvent the more particles there will be. This means the particles are squashed in a certain amount of space. Therefore the particles are more likely to collide more often with the solute. In an earlier experiment, we investigated how the surface area affects the rate of reaction. We put limestone into acid and observed how much gas it collected. ...read more.


Fair and Accuracy This experiment was a fair test. Each time 25cm3 of acid and 1cm of magnesium was used. Also we started the timer exactly when it hit the acid and stopped it as soon as the Tasneem Husain reaction was completed. As the reaction took place, we observed it at eye level. We did not shake the test tube as the reaction took place. Here are some extra things that we kept the same: it was on the same day, the magnesium was cut from the same strip (therefore the magnesium had the same surface area) and the same test tubes were used each time. If I were to get an odd result, while carrying out this experiment, I shall check whether or not I followed the method properly. I would still record the result(s) in my table. However I would note down which step, in the method, I missed out or incorrectly followed. In order to make my results more accurate, I would repeat this experiment at least three times. Safety As we were doing this experiment we wore safety goggles because we were using acid. ...read more.


As the temperature increased, the kinetic energy of the particles also increased. Due to the fact that the particles were moving around more quickly, the collisions are likely to take place more often and therefore making the reaction faster. Another way that we could have made the results more accurate is by weighing the magnesium to make sure that it is the same mass each time. We could have used a wider variety of concentrations to see by how much the rate of reaction changes. For example we could have used concentrations like 0.5 molar, going up in half a molar, all the way up to 7 molar. Also we could have repeated the same experiment, say 5 or 6 times, to make the results more accurate. Another way that we could have made our investigation more accurate is by using different metals and substances in the acid to see whether it makes any difference to the rate of reaction. Other Tasneem Husain than these points that I have made, I feel that these results are quite reliable. On Graph 1, only one of the results was odd. We know that the result was odd because it did not fit on the curve. ...read more.

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