After several hours, you will notice that the penny that was in the saltwater solution will begin to corrode faster than the one that was not.

Remove each penny after the waiting period and place them on a clean paper towel. Allow the pennies to sit in the cups for five minutes. Pour distilled water over both pennies, adding a teaspoon of salt to only one of the cups. Place two clear plastic cups side by side, dropping a single copper penny onto the bottom of each. Saltwater is more corrosive to metals than freshwater and the proof is visible when the two are put to the test with a copper penny. After one week’s time, you should notice that the penny is nice and shiny, indicating that the soda has eaten away at the tarnish a testament to its corrosive nature. Check the cup every day for one week to note any changes to the penny. Simply place the tarnished penny in the bottom of a clear plastic cup and pour just enough soda over the penny to cover it. Test the corrosive qualities of soda using your favorite can of pop and a tarnished penny. After a few hours, the penny will begin to turn green from corrosion. Remove the penny from the cup and place it on a clean paper towel. Now that the copper surface is clean and exposed to the oxygen and moisture in the air - watch what happens next. You will notice that the penny comes clean almost immediately after pouring on the vinegar. Sprinkle a dash of salt onto the penny, followed by a capful of white vinegar. Simply lay a copper penny on the bottom of a clear plastic cup. The salt and vinegar experiment is a fun way for kids to learn what copper looks like when it corrodes.

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