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Electrolysis - investigation to find the amount of copper gained or lost on the electrodes using a different amounts of current each time during electrolysis. How does the changing of the current and surrounding temperature effect the electrodes?

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Introduction

Electrolysis Jamie Maunder Aim: The aim of the investigation is to find the amount of copper gained or lost on the electrodes using a different amounts of current each time during electrolysis. How does the changing of the current and surrounding temperature effect the electrodes? Variables: Throughout the experiment I will change the amount of current used. I will measure the weight of the electrodes after each test. To make the test fair I will be keeping the same electrodes throughout the experiment. Prediction: I predict that as the current increases the mass gained on the anode will decrease and the mass gained on the Cathode will increase. The reason that I predict this is due to what I have been taught this year about the process of electrolysis. Electrolysis is the process of decomposing the compounds by electrical energy and an element is produced at each electrode. In this case I have chosen copper sulphate solution to electrolyse. In the experiment when the solution is being electrolysed it starts to decompose and at cathode there is copper formed and oxygen at the anode. ...read more.

Middle

I will collect accurate results by repeating the experiment twice I will then take these results to work out an average result table. I will make the experiment safe by making the following precautions: * Electricity is dangerous therefore I will be careful while connecting the apparatus and always check that the power supply is turned off while connecting the apparatus. * Too much electricity is also dangerous because it might cause the equipment to work over load causing it to break. * I will also wear safety goggles this is due to the copper sulphate that I will be working with e.g. the solution could get vigorous and splash into my face. Observing: I will now record my results in the table below: Voltage (amps) Start mass End mass Difference Anode (g) cathode(g) anode (g) cathode (g) anode (g) cathode (g) 2 0.79 0.77 0.8 0.76 -0.01 0.01 4 0.76 0.88 0.71 0.81 0.05 0.07 6 0.59 0.89 0.62 0.84 -0.03 0.05 8 0.44 0.92 0.55 0.89 -0.11 0.03 10 0.36 0.93 0.44 0.91 -0.08 0.02 12 0.24 0.97 0.36 0.96 -0.12 0.01 I will now repeat the experiment to make sure that my results are correct: Voltage (amps) ...read more.

Conclusion

There appears to be no odd results on both the anode and cathode. I have also illustrated this pattern with a line of best fit. The patterns seen on both graphs are what I predicted. I predicted that as the current increases the mass gained on the anode will decrease and the mass gained on the Cathode would increase. I have explained in my prediction why these patterns took place. Evaluation: My results did show patterns, that being that as the current increases the mass gained on the anode decreases and the mass gained on the Cathode increases. I was able to make accurate measurements and my results were reliable as I repeated the experiment twice and worked out an average of the results I gained. Only two of my results did not fit a pattern I have stated this in the Analysis of the investigation. With there being only two odd results I had enough results to see a clear pattern. All the equipment worked properly in the experiment. Overall the investigation went well if I were to change any thing I would measure the concentration of the copper sulphate solution rather than the power of the current. ...read more.

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