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Mixing vinegar (acetic acid) and baking soda (sodium hydrogen carbonate) creates carbon dioxide gas, which causes the fizzing and bubbling. The chemical reaction produces sodium acetate, water, and carbon dioxide gas. It is a classic acid-base reaction, where the acid (vinegar) reacts with the base (baking soda) to form a salt (sodium acetate) and water. The carbon dioxide gas produced is what causes the fizzing and bubbling.