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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.
Types. Lemon juice is a very acidic fruit juice with an average pH of 2.3, writes Robert Clemens in his book âOrganic Acids in Citrus Fruits.â He notes that citric acid is the predominant organic acid in it, with smaller but significant amounts of ascorbic acid (vitamin C).The juice also contains malic acid.According to a study by the National Institutes of Health, lemon is a rich source of citric acid, containing 1.44 g per ounce. The USDA National Nutrient Database reports that each cup of lemon juice contains 112.2 mg of ascorbic acid and 0.251 mg of pantothenic acid.dentification. Lemon juice is a tangy, acidic liquid extracted from the fruit of the lemon tree, Citrus limon. The lemon is a small, light-yellow fruit with a pungent rind (peel) that contains pale yellow segmented pulp that holds the fruitâs juice.