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Electrolysis COursework

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Electrolysis Coursework Aim: To investigate whether increasing the voltage through a copper sulphate solution increases the amount of copper extracted. Introduction: Electrolysis is the process in which an electric current flowing through a water solution of a chemical breaks that compound up into its component parts. I will be investigating how changing the voltage through an ionic copper sulphate solution, increases the amount of copper extracted on to the anode. I will do this by varying the voltage to calculate the effects of this factor on the original mass and solution mass after. From this I will calculate the difference, so it is easy to compare and evaluate. Apparatus: - Power Supply Unit (PSU) - Top Pan Balance - Wires - Electrodes - Anode - Electrode holder - 20cm� CuSO4 solution - Small Beaker - Measuring Cylinder Prediction: I predict that the higher the voltage the higher the amount of copper on the cathode. In the same way, I also predict that the lower the voltage the lower the amount of copper on the cathode. ...read more.


These relate to the quantity of electricity which passes through an electrolyte to the amount of the substances formed. Faraday's first law states that the first amount of the substance is proportional to the quantity of electricity. Faraday's second law states that the amount of the substance deposited is inversely proportional to the size of the charge on its ion. Fair Testing: To keep the experiment fair, I will keep all the factors that I am not investigating constant. These will be: the same amount of Copper Sulphate solution every time, the same concentration each run and the same time interval for electrolysis to occur. I will use the same method for every change in voltage Method: 1. I plan to fill a beaker to 20ml3 with Copper Sulphate solution. This will be the set amount every time. 2. Then weigh the carbon rod which will be the cathode and record the mass. Set up the apparatus as shown on the diagram below. 3. The concentration of the solution will be the set amount every time (0.5 molars). ...read more.


The graph and my results support my prediction that as the voltage increased, a larger amount of copper will be extracted. Evaluation: On the whole, I think that this investigation went quite well and I carried it out well in the conditions provided. My range of four results was adequate to plot a graph which supports my hypothesis, giving enough evidence to form a conclusion. There were not any anomalies showing that the experiment was accurate and reliable. I chose this method of setting up my circuit because it is a standard and also it is a standard and also it is the simplest and easiest to set up. I used carbon electrodes. There were some sources of errors such as weighing the cathode before and after. This is because they were measured on the top pan balance, which is very sensitive, and could sense movement of air particles from a fair distance away, hence the mass obtained could never be 100% accurate. Other possibilities that I could explore further are: trying different solutions other than copper sulphate and trying different concentrations. Overall I think I carried out the experiment well and was able to get valid results. ?? ?? ?? ?? Tejpal Vig Science Coursework Ms Virdee ...read more.

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