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Fruit and Vegetable Batteries

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Science Coursework

Fruit and Vegetable Batteries

Investigation 1:

Aim: To find out which combination of metals provided the highest voltage, when stuck into a potato. The metals I used were; Copper, Iron, Zinc and Magnesium.

What I found: I found that when Magnesium and Copper were put together, they gave off the highest voltage.

Table of Results:

Combination of metals

Voltage (V)

Copper & Zinc

0.75

Copper & magnesium

1.37

Copper & Iron

0.49

Zinc & Magnesium

0.67

Zinc& Iron

0.31

Graph of Results:

image00.png

Investigation 2:

Aim: To use the metals that gave off the highest voltage from investigation 1, and see if they can give off voltage whilst running through different types of fruit.

What I found: I found that the fruit that gave off the highest voltage was an orange,- and highly acidic, which led me onto investigation 3, and the question- do acidic fruits give off a higher voltage?

Table of Results:

Fruit / Vegetable

Voltage (V)

Banana

1.36

Orange

1.7

Kiwi

1.67

Apple

1.57

Lemon (Old)

1.63

Graph of Results:

image01.png

Investigation 3:

Aim: To find out what happens to the voltage of the metals, when placed into a beaker containing citric acid, and then what happens when the level of citric acid is increased.

What I found: I found that the level of citric acid fluctuated between each of a tenth of a gram that was added to the acid. But overall, I found that the higher the level of citric acid in the water, the higher the voltage.

Table of Results:

Mass of Citric Acid (g)

Voltage

0.1

0.65

0.2

1.69

0.3

1.72

0.4

1.67

0.5

1.69

0.6

1.68

0.7

1.69

0.8

1.7

0.9

1.74

Graph of Results:

Conclusion:

I have found that the combination of Magnesium and Copper was very strange, because Magnesium is a strong- more reactive metal, and Copper is weak- less reactive metal, I didn’t think that it would prove to be the best combination. I would have thought that Iron and Magnesium would have been a better combination, and provide more voltage. I also found that less acidic fruits provide less voltage, in comparison to more acidic fruits. I predicted this would happen. I also found that the higher the level of citric acid added to a beaker of water, the higher the voltage provided.

To get the most amount of voltage, I have found that you should use; Magnesium and Copper, Acidic Fruits, and lots of Citric Acid.

By. Sarah-Jane Morris 9B/LB

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry section.

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