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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.
The lemon tree bears tart yellow fruits that are rich in vitamin C. The lemon is a citrus fruit and has multiple uses. The pulp yields juice that is used in flavoring foods and drinks. Lemon juice can also be used as a bleach in the printing of cotton fabrics.