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Investigate whether voltage affects the rate of electrolysis?

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Introduction

Coursework By Duncan Shears 15/09/02 Aim: To investigate whether voltage affects the rate of electrolysis? Independent variables: The voltage is going to be increased to see if it affects the rate of electrolysis and how much copper is transferred from the anode to the cathode. I will note down if, the rate of electrolysis grows with the increase in voltage and if so how much. Dependent variables: At each voltage I am noting down how quickly electrolysis occurs. To get results we must measure how much the cathode gains in weight and how much the anode loses. We must measure the weight of the electrodes before the experiment and after to see the increases in weight at the cathode and decrease at the anode Controlled variables: To ensure a fair test, the amount of copper sulphate must be kept the same. The time the experiment is done for must be kept the same for each voltage. I must use the same anode and cathode throughout the experiment. ...read more.

Middle

the negative side of the power pack, this is now your * The cathode should increase in weight as copper is added to it, and the Anode should decrease in weight as copper is taken from it. * Now switch the system on and the anode should dissolve because its atoms give up electrons to form ions: Cu Cu2+ 2e-, start the timer as soon as you turn on the current. The cathode should collect copper and the anode should lose it through Electrolysis. * After 5 minutes stop the timer and turn off the power supply and dry with the hair dryer and weigh the anode and cathode. * We will do this twice for each size voltage, 2, 4, 6, 8, and 12, to get an average until we have a set of results. Safety: Lab coats should also be worn as to not dye or get and liquid on your clothes. ...read more.

Conclusion

Also you can see from the second one that the weight of the anode decreased through the experiment as the metal was taken from the anode and added to the cathode. From 1.23 to 0.52 there is a clear decrease in weight on the anode, and an increase on the cathode. Conclusion: In conclusion my results have proved my prediction, as the voltage increased the faster electrolysis occurs, to be true. As the cathode grew in weight and the anode shrank in weight, which proves that electrolysis did actually occur. Evaluation: The results that I collected from this experiment I may have had one anomalous result, which could have been a result of a concentration error or timing the experiment not for the 5-minute period. I think I used good reliable equipment but to get a more reliable set of results could have changed the anode and cathode for each set voltage! I think I had a good range of results that displays my prediction and what I was trying to prove in the experiment. ...read more.

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