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Experiment to see how a difference in temperature affects the rate of reaction between Magnesium and Hydrochloric Acid.

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Introduction

Experiment to see how a difference in temperature affects the rate of reaction between Magnesium and Hydrochloric Acid Aim: My experiment is to find out how long 3cm strips of magnesium (Mg) will take to dissolve in 15ml of hydrochloric acid and 150ml of water. This test tube will all be held inside a 250ml glass beaker. I will be using five different temperatures of acid - 30, 35, 45, 55, and 70 degrees Celsius, and will record my results in a table. One reason I chose to change the temperature of the water as appose to other methods of resolving this experiment is because of the convection currents moving upwards through the water - this will make the magnesium float, consequently making things a lot easier and fairer. Background information: Magnesium has an atomic number of 12 and its symbol is "Mg" It is a shiny grey metallic element and found in group two of the periodic table of elements. Magnesium is the lightest of the commonly used metals and has a melting point of 648.8 degrees Celsius, and a boiling point of 1090 degrees Celsius. Magnesium is alloyed with other metals to make them lighter and more easily to weld. It burns vigorously in the earth's air and produces a bright white Light. ...read more.

Middle

I will heat the tap water over a Bunsen burner to the required temperature for each test tube. The temperature will be measured with a thermometer which I will suspend in the water making sure that it does not touch any part of the glass beaker. When at the required temperature, I will place the test tube with 15ml of hydrochloric acid, and 3cm of magnesium into the glass beaker and start the digital stopwatch. The stopwatch will continue until the magnesium has completely dissolved and the results will then be recorded. During this experiment safety precautions need to be taken. I will ensure that my safety goggles are worn at all times, and I'll also make sure that I have sufficient room to perform the experiment safely. Equipment will be thoroughly checked before I begin which will prevent any kind of accident. I will use full advantage of my test tube rack rather than holding and carrying test tubes in my hand. In addition to this I will make sure there are no dangers concerning me or my classmates whilst performing my experiment. Diagram of Experiment: Evaluation: It is clear, after studying my table of results, that the results themselves were drastically varied. This could be down to a number of reasons; the strip of magnesium may have been floating on the bubbles as appose to the acid, this would slow the rate of reaction down. ...read more.

Conclusion

I think my results would have benefited a great deal if I had had longer to measure in both length and weight my magnesium more accurately because, even the slightest change in length or weight will change the rate of reaction and effect the final result. Other things could also have been improved. For instance, making sure all measuring equipment and test tubes were thoroughly cleaned and dried before I started a new test. This is important because even a miniscule drop of water in the test tube will dilute the acid and slow the rate of reaction / amount of atomic collisions down - thus reducing the chance of a fair result. Conclusion: All in all, I would say that my experiment went reasonably well without any accidents or damages. The practical side of things were very enjoyable and I have learnt a great deal from it. As shown in my evaluation, there were a few unfortunate aspects which where unavoidable - the limitation in time, for instance, consequently resulting in rushed or inaccurate measurements. These problems would definitely be rectified if I had the chance the try this experiment again. Overall, I think things went quite smoothly and I am pleased with the outcome. ...read more.

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