What acids are in Pepsi to clean a penny?

Pepsi, like most sodas, contains phosphoric acid. This acid is what helps to clean the penny by reacting with the copper oxide layer that forms on the surface of the penny, giving it a dull appearance. The reaction removes the oxide layer, revealing the shiny copper underneath.

Important Note: While Pepsi can clean a penny, it's not the most effective method, and it's not a good idea to use it as a regular cleaning solution. Other methods, like using vinegar or lemon juice, are safer and more effective.