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Find out whether or not changing the depth of the electrolyte affects the current.

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Introduction

Aim: My aim is to find out whether or not changing the depth of the electrolyte affects the current. If so, is there a connection

Method: I will set the experiment up as shown in the diagram. I will increase the depth of the electrolyte by 25ml each time. I will repeat the experiment 3 times to make sure I can spot any anomalous results. This way my results will be more accurate.

Scientific Prediction: I predict that as I increase the depth of the electrolyte the current will be increased. By increasing the depth of the electrolyte it increases the surface area or the electrodes. By increasing the surface area the rate of reaction has increased,

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Middle

4

0.45

0.42

0.67

100

4

0.67

0.65

0.34

Once I had made the adjustments I took my real results.

Depth (ml)

Voltage (V)

Current (A)

Current (A)

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Conclusion

Evaluation. I did not recognize any anomalous results; this is probably because I only had one variable and nothing else changed.

The line was easy to draw as it was nearly straight and passed through the origin. If I were to repeat the experiment I would to 5 repeats to make my results more valid. If I wanted to do an extension to my work . I could change the shape of the electrode, which would again change the surface area, so I could have flat electrodes instead of round ones. My results and graph still support my prediction.

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