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An Investigation to determine how much copper can be electroplated under a given condition.

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Introduction

An Investigation to determine how much copper can be electroplated under a given condition. Planning Aim The aim of this experiment to be carried out as coursework is to investigate how much copper can be electroplated. Background Knowledge Electroplating is the process of coating with metal by means of an electric current. When electroplating takes place it makes the metal stronger, this is due to the electrode being made up of the same metal of what is being deposited on the electrode. Diagram to show the chemical process of electrolysis A 6 volt battery supplies electric current, which is controlled by a resister. When the circuit is closed, the cathode bar, which holds the work to be plated, is charged negatively. Some of the electrons from the cathode bar transfer to the positively charged copper ions (Cu2+), setting them free as atoms of copper metal. These copper atoms take their place on the cathode surface, copper plating it. An number of sulphate ions (SO4 2-) are discharged on the copper anodes, thereby completing the electrical circuit. In so doing, they form a new quantity of copper sulphate that dissolves in the solution and restores it to its original composition. ...read more.

Middle

7. Using a measuring cylinder, pour out 50cm3 of copper II sulphate solution 8. To complete the setup and begin the experiment, place the electrodes into the copper II sulphate solution making sure they are parallel to each other. 9. Clip them to the edge of the beaker and using the variable resister adjust the current to 0.2amps (starting amount), 10. Start the timer 11. Allow 5 minutes before disconnecting the circuit and removing the electrodes. 12. Rinse the electrodes using acetone 13. Weigh each electrode, and record the mass. 14. Repeat steps 4-12 but varying the current each time at the following: 0.4A, 0.6A, 0.8A, & 1.0A. Prediction I predict that the out come is to be is the amount of input current will decrease & the amount of copper being gained will increase. Results Each experiment was timed for 5minutes. Experiment 1 A N O D E Current Weight at Start Weight at End Weight Gain/Loss C A T H O D E Weight at Start Weight at End Weight Gain/ Loss 0.2 0.61 0.60 0.1 (Loss) 0.70 0.72 0.2(Gain) 0.4 0.60 0.57 0.3 (Loss) 0.72 0.76 0.4(Gain) 0.6 0.57 0.54 0.4 (Loss) 0.76 0.81 0.5(Gain) 0.8 0.54 0.48 0.6 (Loss) ...read more.

Conclusion

on to the anode as well, and secondly the increased current itself has the effect of making less ions sticking to the cathode. The anomalous result for in the 0.40A value for the anode was probably caused by one or both of the crocodile clips touching the solution, so less electrons flow through the copper, and so less are transferred to the cathode. The ranges of my results were from 0.2A to 1.00A, with an average discrepancy of ______from the average reading. If this experiment was to be done more accurately, I would have to use more accurate apparatus, such as a newer ammeter, a balance with more digits, a more accurate way of controlling the current, maybe with a computer, and likewise with the temperature. I also could have kept the size and separation of the electrodes the same. I also could have made sure that the crocodile clips were completely out of the electrolyte. Also I could have taken a much wider range of readings, from 0.01A to 10A at smaller intervals, and I could have timed for different times, and I could have investigated the other variables, such as the temperature of the electrolyte, the concentration of the electrolyte, the separation of the electrodes, and the size of the electrodes. ?? ?? ?? ?? Rishul Shah ...read more.

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