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How corrosive are certain liquids against old and dirty coins?

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Liquids (Water, Milk, Coca Cola, Vinegar)

4 old coins

A measuring Cylinder

4 separate beakers

4 separate test tubes

A test tube holder

Parafilm and marker

iPad Camera

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I think the coins would come out cleaner then they were before they went into the test tube with vinegar and coca cola

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Get 4 old coins and take a picture of them before you put them in the test tubes.

Measure 30 cm³ of each liquid using the measuring cylinder and pour them into separate test tubes

Label each test tube with Parafilm so that you don’t mix up the liquids

When you are ready, put the coins in the test tubes.

Leave them in the test tubes overnight.

After a night, take the coins out of the test tubes and take a picture of what they look like now.

Note the changes from when they first went in to when you took them out.

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My hypothesis was right, the coins came out shiny.

This is because certain liquids contain acid (vinegar = acetic acid, Coca Cola = Phosphoric acid) and the rust on the coins contains copper oxide

The acid reacted with the oxide and “cleaned” the coins.

The milk and water had no impact whatsoever on the coins.

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I had no Coca Cola with me on the day of the experiment, so I had to do it a week later when I had some and when I had time.

I had no spare time or classes during the week to complete the experiment, so I was delayed a week when finishing the experiment.

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I could use 10c or 20c coins, which are gold coloured, that are old and dirty, to see if there is a similar or the same effect.

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I could try and use more liquids that contains acids or bases, even ones who contain little acid or base. As the milk and water had no impact on the coins

I could record the pH of the liquids before using them.

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I used a different liquid for each coin

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I measured 30 cm³ of each liquid to put in the test tube

I used 4 5c coins that look similar and are old and dirty

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The Beaker, the Measuring Cylinder, the Test Tubes and the Test Tube Holder

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The Beaker, the Measuring Cylinder, the Test Tubes and the Test Tube Holder

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(Coca- Cola)

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(Water, Milk, Vinegar)