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Find out the theoretical yield of Magnesium Oxide, find the percentage yield of Magnesium Oxide identify any possible errors in the practical.

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Introduction

The Preparation of Magnesium Oxide. Aim: The aim of this coursework is to find out the theoretical yield of Magnesium Oxide, find the percentage yield of Magnesium Oxide identify any possible errors in the practical. Apparatus/ Equipment list: * 1 Crucible with lid. * 10cm Strip of Magnesium strip. * Emery cloth. * Bunsen Burner * Tripod. * Tight Spiral * Heat Proof Mat Risk Assessment: When doing this experiment you must be careful not to hurt yourself. As you can see, the equipment above doesn't seem all that dangerous so not much precaution must be taken when doing this experiment. * Wear Gloves: - You must always wear gloves when doing experiments, but For this experiment its not really necessary so you can wear it Depending on your own choice. * Wear Lab- Coat: - You must always wear a lab coat from the very beginning Of the experiment and this is really necessary, in not Wearing a lab coat you could most probably spill something Onto yourself and this could be highly dangerous. * Wear Safety Goggles: - You must also wear safety goggles at all times they help Help in protecting the eyes from anything in reach with It that is hazardous or dangerous in any form or way. ...read more.

Middle

this will give you the mass of the magnesium strip roughly. * Then roll up the magnesium strip and put it into the crucible and then cover it with the lid making sure that there are no small gaps for oxygen to enter the crucible. * Heat the crucible over the Bunsen burner for a maximum of ten minutes and every two minutes remove the Bunsen burner from underneath the crucible and lift the lid a slight bit to let in a fraction of air inside the crucible. * Turn off the Bunsen burner and then allow the crucible to cool for at least fifth teen minutes, when its cooled down record the mass of the crucible + lid + magnesium oxide and then find out the mass of the magnesium oxide (mass of magnesium oxide + lid + crucible) - (mass of crucible + lid). Then write down the results in the table. * Finally clean away all the apparatus and return them to where they belong. Mass (g) 1. Mass of Crucible + lid (empty) 21.47 2. Mass of Crucible + lid + magnesium ribbon 21.52 3. Mass of magnesium Ribbon (2 - 1) 0.05 4. Mass of Crucible + lid + magnesium oxide 21.53 5. Mass of magnesium oxide (4 - 1) ...read more.

Conclusion

Can you identify any possible errors in this practical? * I can firstly identify that there may have been a problem when cleaning the magnesium strips, they may not of been cleaned with the sand paper good enough so this might have caused an miscalculation of some sort in the experiment. * The magnesium strips may have been overheated and the experiment should've had an approximate time for the magnesium to be heated. * When weighing the crucible, magnesium strip etc, I noticed that the results on the weighing scale kept on changing. I weighed the crucible and lid and the results on the weighing scale kept on switching from 21.47 to 21.49 so I just decided to go with 21.47g * The tight spiral wasn't much of a good support for the crucible and the crucible kept on tilting at odd angles because of this, which causes the lid to lift off a-bit and a-bit of the magnesium oxide ashes blew into the air. 4. Can you make any recommendations of how the yield for this reaction could be improved? The yield for the reaction could have been improved probably if you was to use a longer length of magnesium strip or maybe if you was to heat the magnesium strip longer or shorter period of time. ...read more.

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