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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.
One lemon contains a full dayâs supply of ascorbic acid, or vitamin C, but thatâs the whole fruit; the juice holds about a third. Lemon juice is also about 5 percent citric acid, making it a natural for slowing the browning or oxidation of fresh, raw foods: apples, avocados, bananas, and other fruits.ne lemon contains a full dayâs supply of ascorbic acid, or vitamin C, but thatâs the whole fruit; the juice holds about a third. Lemon juice is also about 5 percent citric acid, making it a natural for slowing the browning or oxidation of fresh, raw foods: apples, avocados, bananas, and other fruits.