Thursday, January 27, 2011

Shiny coins

by Miruna and Beatrice

Materials you will need: paper towel , lemon, knife, plastic cup or bowl, dirty/old copper coins

Cut the lemon ans fill the cup/bowl with some lemon juice. Put the dirty copper coins in the juice and let them soak for a few minutes. Remove the coins from the cup/bowl and place on the paper towel..

Oxygen in the air reacts with copper, making a copper oxide coating. This is what makes copper coins dirty. The acid in the lemon juice reacts with the oxide and removes it from the coins – making then shiny copper coin.

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