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Soaking a copper penny in lemon juice makes an old penny look new. Lemon juice removes the copper oxide coating. Adding salt to the lemon juice will clean the penny more effectively. This simple experiment is an easy way to demonstrate some basic scientific principles about oxidation and chemical reactions to children.
Citric Acid. An acid solution weakens the bonds that formed between the copper and oxygen atoms to create the copper oxide. Citric acid, contained in lemon juice, is a weak acid that will break those bonds.The experiment can be repeated with other acids, such as vinegar.ait five minutes, then remove the penny from the lemon juice. The penny will get cleaner the longer it sits in the solution. Wipe it with a white paper towel. Any remaining dirty coating, which is actually copper oxide, will rub off as an orange stain on the paper towel, leaving the penny clean and shiny.