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The Electrolysis of Copper Sulphate.

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Introduction

The Electrolysis of Copper Sulphate Aim Analyse and evaluate the quantity of Copper (Cu) metal deposited during the electrolysis of Copper Sulphate solution (CuSo4) using Copper electrodes, when certain variables were changed. Results Voltage across Concentration of solution electrode 0.5M 1.0M 2.0M 2 5.0 10.6 19.5 4 10.5 19.8 40.3 6 14.3 26.0 60.2 8 15.2 40.4 80.3 10 15.0 40.2 99.6 12 15.1 40.0 117.0 Analysing/Conclusion The input variables in this experiment are; concentration of the solution and the voltage across the electrodes. The outcome is the amount of copper gained (measured in grams) at the electrodes. By analyzing the graph, we can see the rapid increase of weight gained for the 2.0 molar concentration as the gradient is steeper. ...read more.

Middle

Increasing the concentration is more affective than increasing the voltage but in order to gain more copper, you will need the highest concentration AND voltage. The higher voltage allows the particles to move faster to the electrode as they gain more energy. And the higher concentration contains more concentrated particles. Consequently, when the concentration doubles, the weight gained also doubles approximately. Furthermore, when the voltage is increased, the weight also doubles roughly but in some circumstances such as at 8-12 volts, the weight would decrease or stay roughly the same. Accordingly, I may be able to conclude that doubling the voltage has no relationship with the weight doubling. Evaluation I think that the experiment conductor(s) collected enough sufficient evidence for firm conclusions to be drawn. ...read more.

Conclusion

It is also important to ensure the flask is dry because if water is added to the sulphate solution, it would become less concentrated (possible neutral). The ions would diffuse into the water particles meaning the reaction would take longer to complete than the solution without the addition of water. Lastly, the results could have gone wrong because the electrode can no longer hold anymore copper because the solution has become saturated Overall I am quite satisfied with the result although I would rather do the experiment by myself. If I could I would conduct the experiment again but I would use a dry, clean flask changing it regularly and repeat the experiments more i.e. 3 times. This will enable me to calculate an average to get a more reliable and accurate result. ?? ?? ?? ?? - 1 - ...read more.

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Here's what a star student thought of this essay

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Response to the question

A very well done experiment. The only things lacking are a solid introduction and prediction, but this is made up for by a very strong analysis and evaluation of the experiment at the end. The candidate should include a method/diagram ...

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Response to the question

A very well done experiment. The only things lacking are a solid introduction and prediction, but this is made up for by a very strong analysis and evaluation of the experiment at the end. The candidate should include a method/diagram of the experiment so they show their understanding of the variables and what might have gone wrong.

Level of analysis

The aim is explained clearly but I would like to see some sort of prediction backed up with scientific principles to show the candidates understanding of the science behind the experiment and not just the values. They didn't explain which variables they were changing and why, or why they might keep certain variables constant which would have again showed their understanding through manipulation of the experiment and prediction of the results. The table is good with consistent decimal places although the concentration of solution and what we are measuring is not really clear from the table design. The analysis is very good with high scientific accurate detail and equations. The evaluation is also very good with explanations offered for the possible errors with improvements.

Quality of writing

Spelling, punctuation and grammar all to a good standard. The tone and format of the piece is also excellent.


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Reviewed by skatealexia 03/08/2012

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