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Does Current Affect The Amount Of Copper Transferred During Electrolysis With Copper Electrodes In A Copper Sulphate Solution?

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Introduction

Does Current Affect The Amount Of Copper Transferred During Electrolysis With Copper Electrodes In A Copper Sulphate Solution? By Will McEwan Aim To investigate how the amount of copper transferred during electrolysis is influenced by the current. Prediction I predict that with a greater current, more copper will be transferred. They will be directly proportional. Hypothesis The Copper atoms are using the electrolyte (copper sulphate) to transfer themselves between the two electrodes. If the current increase then the amount of copper atoms crossing between the electrodes also increases, thus increasing mass of copper transferred. Apparatus Ammeter Beaker Cell Pack Stopwatch Copper Sulphate Solution Copper Electrodes Crocodile Clips Scales Propanone Iron Wool Variable Resistor Wires Diagram Method * Take the copper electrodes and clean them with iron wool (to remove impurities on surface and aid electrolysis), taking care not to get splinters of iron into fingers. ...read more.

Middle

The time that each current is run for should also be kept constant. Preliminary Work Using background knowledge that Q=IT: Q is Charge in Coulombs I is Current in Amperes T is Time in Seconds And the relative mass of Copper is 64. With this information it became possible to predict what a perfect set of results should be: Preliminary Prediction I (amps) T (Mins) T (secs) Q (Coulombs) F (Faradays) Moles Cu Mass Cu (g) 0.50 5.00 300.00 150.00 0.001563 0.000781 0.050000 0.45 5.00 300.00 135.00 0.001406 0.000703 0.045000 0.40 5.00 300.00 120.00 0.001250 0.000625 0.040000 0.35 5.00 300.00 105.00 0.001094 0.000547 0.035000 0.30 5.00 300.00 90.00 0.000938 0.000469 0.030000 0.25 5.00 300.00 75.00 0.000781 0.000391 0.025000 0.20 5.00 300.00 60.00 0.000625 0.000313 0.020000 0.15 5.00 300.00 45.00 0.000469 0.000234 0.015000 0.10 5.00 300.00 30.00 0.000313 0.000156 0.010000 0.05 5.00 300.00 15.00 0.000156 0.000078 0.005000 Graph Of Preliminary Prediction Of Copper Transferred Results Due to time constraints my readings had to taken in two parts. ...read more.

Conclusion

However, my preliminary results fully support it. In theory my prediction is right, but in practice it is near impossible to give supporting evidence. Evaluation My experiment was performed under very basic conditions. From the preliminary work I can see that it is not my prediction that is wrong. I believe that given perfect lab conditions and enough time I could prove my prediction right. In my experiment I lost a lot of copper in the electrolyte. I could improve my experiment by filtering the electrolyte each time and weighing the filtrate with the paddles this would prevent loss of mass. When drying the paddles I sometimes oxidised the copper and this added mass. In future the paddles could be dried by different means such as a hairdryer on a very low heat. It took about 30 seconds to set the right current, as this is 10% of the total time this could have an effect on the amount of copper that was transferred. To overcome this problem, a digital resistor could be used that automatically sets the amount of current. ...read more.

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