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The aim of the coursework is to investigate the rate of reaction between hydrochloric acid and magnesium.

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Chemistry Coursework Nick Jones Rates of Reaction Aim The aim of the coursework is to investigate the rate of reaction between hydrochloric acid and magnesium. I have chosen to investigate this by looking at the amount of hydrogen produced and time taken. My chosen variable to investigate this further is the concentration of the hydrochloric acid, and if this affects the rate of reaction and by how much. Background Knowledge - Collision Theory In order for magnesium and hydrochloric acid to react, their molecules must collide with enough energy so a reaction can occur. The reaction that occurs is as follows: Equation : Mg + 2HCL --> MgCl2 + H2 Magnesium + Hydrochloric --> Magnesium + Hydrogen Acid Chloride One molar strength hydrochloric acid has half of the amount of atoms than two molar strength hydrochloric acid has; therefore collisions of the particles occur twice as often. ...read more.


Apparatus 4cm Magnesium ribbon strips x15 Hydrochloric Acid- in 1/2 M, 1M, 2M, 3M and 4M strengths 100cm� measuring cylinder 25cm� measuring cylinder 250cm� conical flask Rubber bung and delivery tube Water bath Stopwatch Safety goggles Method The bowl is filled half full with water, and the 100cm� measuring cylinder is filled with water and turned upside down, forming a vacuum. The end of the delivery tube is under the water beneath the measuring cylinder, so that when the hydrogen is produced it is collected in the measuring cylinder. 25cm� of the chosen molar strength acid is then placed into the conical flask. The strip of magnesium is dropped into the acid, and the rubber bung replaced as quickly as possible. ...read more.


There is no obvious numerical link between the different molars, apart from the fact that as the molar increases, the rate of reaction doesn't increase proportionally; for example, the rate of reaction increases dramatically as the molar doubles. Evaluation In my opinion the investigation was a success and was carried out accurately. However, there are some factors which could be improved to make for a more accurate result for possible future investigations. One such factor is that of using the magnesium ribbon. Using 4cm strips is not very accurate, and could be improved by measuring out a specific mass. Also, using a lower molar variety of acid would have meant for a slower reaction, thus less hydrogen would escape due to human error. After completing the experiment, I feel that all the experiments were conducted to a suitable degree of accuracy, and I am satisfied with the results that I have received. ...read more.

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