While there have been no serious scientific studies of what makes Mentos candies cause soda to explode, the reason is fairly well explained by scientists such as Steve Spangler who understand surface tension and fluid dynamics.
Mentos Mystery
Mentos candies contain both gelatin and gum arabic, two chemicals that can rip apart the surface tension holding together the molecules of fluids. The pressurized CO2 that makes a soda bubble contains potential energy bound up in the attractive force of the fluid. When the candies are dropped to the bottom of a bottle of soda, they tear the surface tension of the soda, violently releasing the CO2 in a caramel-colored explosion.
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