What will happen to a penny in Ginger Ale?

A penny placed in Ginger Ale will undergo a chemical reaction known as oxidation. The acidic environment of the Ginger Ale, containing carbonic acid, will react with the copper in the penny, causing it to dissolve. The copper ions released into the liquid will form copper carbonate, which will appear as a green film or coating on the surface of the penny. This process is accelerated by the presence of oxygen, which is why the reaction occurs faster in open containers.