I wondered if there was some secret ingredient that made soda bubbly. My friend Kenny McMahon, who researches food science here at Washington State University, and I decided to investigate.
We grabbed a balloon, a bottle of soda and salt. We filled the balloon with about a teaspoon of salt. Then, we twisted the cap off the bottle and stretched the balloon over the top. When the balloon was secure, we tipped in the salt.
Read all of this answer from Dr. Universe at https://askdruniverse.wsu.edu/2016/05/09/soda-why-does-it-fizz/.
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