Why do fizzy drinks fizz up when you put a mint into it?

When you drop a mint candy into a glass of soda, the surface of the candy becomes covered with bubbles. These bubbles are formed by the reaction of the acid in the soda with the carbonate in the candy. The reaction produces carbon dioxide gas, which is what causes the bubbles to form.

Additionally, the ridges and irregularities on the surface of the mint candy provide nucleation sites for the dissolved gas to form bubbles. This creates numerous nucleation sites, resulting in a rapid release of bubbles when the candy is introduced to the soda.

The rising bubbles carry tiny particles of the mint candy to the surface of the soda, which creates a foam. The foam is made up of tiny air pockets that are surrounded by a thin layer of liquid. The air pockets act like tiny mirrors, reflecting light in all directions. This is what causes the soda to look fizzy.