Baking soda ( NaHCO3 ) is the source of the carbon dioxide , and the acid-base reaction can be generically represented as shown : NaHCO3 + H + → Na + + CO2 + H2O The real reactions are more complicated because the acids are complicated .
Baking soda is where the carbon dioxide comes from , and the acid releases it , like this : NaHCO3 + H + → Na + + CO2 + H2O