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To test how the amount of electricity effects the liberation of copper ions, during electrolysis.

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Introduction

Chemistry course-work Electrochemistry Aim: To test how the amount of electricity effects the liberation of copper ions, during electrolysis. Scientific Ideas The prediction of this experiment should be easily done. After gathering all the information about electrochemistry and researching about redox reactions the predictions should be as accurate as possible. Two laws which need to be taken into account are that discovered by Michael Faraday. The first laws states that the quantity of material transformed at each electrode is proportional to the amount of electricity passed through. The second law states that the weight of the elements transformed is proportional to the equivalent weights of the elements, that is, to the atomic weights of the elements divided by their valences (the effective charge) i.e. the equivalent weight = ATOMIC WEIGHT CHARGE My prediction will be base on these two laws. Other background ideas which will help my attempt at a prediction is my knowledge on electrolysis and my being able to implement half - equations. Electrolysis is the passing of an electric current (flow of e-) through a liquid or molten compound dissociates (splits) in ion (charged atoms). An atom which loses an electron becomes positive (CATION) and an atom which gains an electron becomes negative (ANION) - Reduction and Oxidation occur together as opposites -: As metal copper will lose electrons at the at the same time as gaining electrons at the Cathode. E.g. Cu ? Cu2 ? + 2e- (at the Anode) Cu 2 + 2e- ? ...read more.

Middle

To enable my experiment to be a safe as possible, I will always be wearing safety goggles and keep my tie tucked inside my shirt all the time whilst the experiment is going on. I will not disturb or be distracted at any time during the experiment and handle all equipment with the utmost respect. Obtaining and Collecting Data I believe I have gained sufficient results for me to put into a table. As I have mentioned before the most significant readings are: The Number of Grams Lost at the Anode, and The Amount of Coulombs Transmitted Between Each Reading. I will plot the results of 'Grams against Coulombs' on a graph. Seconds Current Coulombs Cu at Anode(g) Total lost at (g) 0 0.5 0 0.56 0.00 300 0.5 150 0.50 0.06 600 0.5 300 0.46 0.10 900 0.5 450 0.43 0.13 1200 0.5 600 0.39 0.17 1500 0.5 750 0.35 0.21 1800 0.5 900 0.32 0.24 2100 0.5 1050 0.28 0.28 2400 0.5 1200 0.25 0.31 I am extremely confident that all of the results are accurate, this is because the same procedure took place for each reading. However, if there is to be a fault in the results this would not be a huge problem because the proportion of the results will be exactly the same which is what is required. The proportion will be the same due to the fact that the experiment was constructed in the same environment for each and every reading. ...read more.

Conclusion

Of course all the apparatus would be made specifically for its job, if it were to produce results of incredible high standards. I would use as little as I could of human assistance because everybody is capable of making a mistake and it is therefore more prone to error than a computer. Almost everything would be computerised in my new improved experiment. I conclude that the amount of electricity DOES effect the liberation of copper ions during the electrolysis. The amount of coulombs transferred is proportional to the amount of copper lost at the Anode. The more coulombs transferred therefore means the more copper is lost from the . If I had to improve the experiment in any way, shape, or form I would attempt to use other variables for example use Current as a variable factor instead of Time. I believe the results would be different, and just as interesting as these have proven to be. Maybe if the experiment was in a better environment, where loss of energy is at its minimum the accuracy could have improved slightly. The accuracy in this experiment was, in my opinion, as good as it could have been. This must be due to the fact that the usage of scientific ideas and planning procedure helped to get the experiment off on the right foot. The priceless information from Michael Faraday and his laws also gave me a head start. I would like to point out that the safety aspect of this experiment was respected at all times. Safety goggles were always on, and ties were always tucked in. There was never a stage in the experiment where I did not have everything under control. Dhivesh Patel 11TC ...read more.

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