What happens when you mix pepsi soda and baking soda?

Mixing Pepsi soda and baking soda results in a chemical reaction that produces carbon dioxide gas. This gas causes a fizzing or effervescent reaction and creates a foam or froth on the surface of the liquid. The reaction is due to the presence of baking soda (sodium bicarbonate), which is a base, and Pepsi soda, which contains citric acid, a weak acid. When the two substances come into contact, the acid and base react to form water, carbon dioxide gas, and a salt (sodium citrate).

The chemical equation for the reaction is:

NaHCO3 (baking soda) + H3C6H5O7 (citric acid) → CO2 (carbon dioxide) + H2O (water) + Na3C6H5O7 (sodium citrate)

The amount of fizzing and foaming produced depends on the proportions of baking soda and Pepsi soda used. The reaction is rapid and usually subsides within a few seconds. It's worth noting that the consumption of large amounts of baking soda can have adverse effects on health, including stomach discomfort and electrolyte imbalances. Mixing Pepsi soda and baking soda is not recommended for consumption and is typically done for science demonstrations or experiments to observe the chemical reaction and gas production.