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# Electrolysis - How is the amount of copper deposited affected by the voltage?

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Introduction

Electrolysis

How is the amount of copper deposited affected by the voltage?

Aim

The aim of this experiment is to find out what effect the change in voltage has upon the amount of copper deposited in 5 minutes. The voltages I will be using are 2, 4, 6, 8, 10 and 12volts; I will use these voltages because they are the only ones available on the power pack. I am doing the experiment for 5 minutes because it is enough time to get a result and it is short enough for doing 6 voltages in one lesson. I will repeat this on another lesson to gain 2 sets of results.

Prediction

I predict that 12v will produce the most copper because there is more energy being transferred into the copper ions making the move quicker.

Fair testing

Middle

Weight before

Weight after

Copper displaced

2v

3.5g

3.6g

0.1g

4v

3.5g

3.6g

0.1g

6v

3.4g

3.6g

0.2g

8v

3.4g

3.6g

0.2g

10v

3.4g

3.8g

0.4g

12v

3.4g

3.9g

0.5g

Test 2

 Voltage Weight before Weight after Copper displaced 2v 3.4g 3.5g 0.1g

Conclusion

ass="c0">3.8g

0.3g

10v

3.4g

3.8g

0.4g

12v

3.5g

4.0g

0.5g

Average results

 Voltage Weight before Weight after Copper displaced 2v 3.45g 3.55g 0.1g 4v 3.5g 3.6g 0.1g 6v 3.45g 3.65g 0.2g 8v 3.45g 3.7g 0.25g 10v 3.4g 3.8g 0.4g 12v 3.45g 3.95g 0.5g

Analysis

I think that the experiment was done fair apart from we couldn’t get the rod the same starting weight each time. My prediction was correct as the test with 12v displaced the most copper

Conclusion

I have found out that the voltage does affect the amount of copper displaced in that if you increase the voltage so do you increase the amount of copper displaced. If I did the experiment again I would try to get the starting weights the same and I would probably change the time instead of the voltage.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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