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In this reaction, baking soda acts as a base, and takes a proton from vinegar, which is an acid. The reaction releases gas because when the baking soda receives the proton, it transforms into water and carbon dioxide.
Answer by Jkm Young. Confidence votes 36.1K. When Baking soda and vinegar are combined, it makes a fizzing reaction when the Acetic acid in the vinegar reacts with Sodium Bicarbonate (the chemical name for baking soda). The result is some water, Sodium Acetate and Carbon Dioxide gas (the bubbles).What actually happens is this: the acetic acid (that's what makes vinegar sour) reacts with sodium bicarbonate (a compound that's in baking soda) to form carbonic acid. It's really a double replacement reaction.  Im awesome   When baking soda (sodium bicarbonate) reacts with vinegar (acetic  acid) you get water, carbon dioxide, and sodium acetate (a salt).  The bubbles that form are caused by the release of the CO2.     Here's the formula (if that helps).    NaHCO3 + CH3COOH a CH3COONa + CH3COONA + H2O(co2). g