It would be helpful to know what Zots do. I'm assuming it's one of those fizzy candies.
Some fizzy candies like the new foamy skittles use crystals of an acid, like citric acid, and a base, like bicarbonate of soda to produce a foaming effect. When the crystals dissolve in your saliva, the acid and base reacts to produce carbon dioxide gas and a salt. Unfortunately this isn't very tasty.
Other fizzy candies like pop rocks are carbonated, like soda. They expose the molten candy to high-pressure carbon dioxide gas, and when it hardens the bubbles are trapped. When the candy dissolves, the gas is released.
Some fizzy candies like the new foamy skittles use crystals of an acid, like citric acid, and a base, like bicarbonate of soda to produce a foaming effect. When the crystals dissolve in your saliva, the acid and base reacts to produce carbon dioxide gas and a salt. Unfortunately this isn't very tasty.
Other fizzy candies like pop rocks are carbonated, like soda. They expose the molten candy to high-pressure carbon dioxide gas, and when it hardens the bubbles are trapped. When the candy dissolves, the gas is released.