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Investigate whether changing voltage will affect the rate of Electrolysis.

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Introduction

Electrolysis Coursework Aim; To investigate whether changing voltage will affect the rate of Electrolysis. Prediction; I predict that by increasing the voltage the rate of Electrolysis increase therefore producing a straight line graph. Hypothesis; In relation to my prediction, voltage is the force that pushes the electrical currents around. The flow of electrons around a circuit is the current. If I increase the voltage, this will provide a further push for the electrons to move more freely. The Electrolyte we used for this investigation was Copper Sulphate. For there to be more Copper Sulphate dissolved, I will have to double the voltage, this means double the push of electrons. At the negative Cathode, impure copper is forced, this is due to the fact that copper has a 2+ charge, and it will move to a negative electrode, in this case the negative Cathode. When the copper Ions are attracted by the Cathode they are called Cations, but in this case the sulphate from the Copper Sulphate solution will not be attracted to the Anode electrode. ...read more.

Middle

Preliminary Test Before proceeding with the experiment itself, I conducted a preliminary test. This was so I could ensure my variables which were; Amount of Copper Sulphate Voltage Time Length of Graphite With the CuSO , I first poured in 150mm into a glass beaker. Later I found this to be insufficient. My group and I found out that the amount of Copper Sulphate was to our surprise also insufficient, this was due to the fact that the graphite rod was not far deep enough in the CuSO solution meaning not enough of the rod was covered to bring about a good reaction. I changed the amount of Copper Sulphate to 200mm, this proved to be satisfactory. We began the preliminary test with 1 volt again this wasn't enough to produce a reaction between the graphite rod and the Copper Sulphate. I decided to start at 2 volts and timed for 5 minutes. ...read more.

Conclusion

At 9 volts the average for the expected amount of copper should have been 1.02. For reasons why these errors occurred I looked at some factors. The first factor I looked at was a possibility that the length of the graphite rods might have affected the outcome of the results at the two volts suggesting that the graphite rods were not deep enough in the Electrolyte. Other factors I considered was there might have been a decrease in the concentration of the solution or inaccurate timing. If any improvements were to be made, I would say, there needs to be an improvement in the efficiency in the equipment provided by the school as I remember some of our power packs not working. During the course of or experiment there seemed to be a shortage or our Electrolyte Copper Sulphate and the accuracy of the balances were poor. To take the experiment further, in relation to Electrolysis, I could look at the temperature, trying to purify copper or by using current to find out the amount of copper gains and looses in the electrodes. ...read more.

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