Asked in VinegarBaking Soda (sodium bicarbonate)
Why does it over flow when baking soda and vinegar are combined?
May 14, 2012 8:09AM
Baking soda, also known as sodium bicarbonate reacts with an acid to form carbonic acid. The disassociation constant of carbonic acid is extremely low and as a result it decomposes into a water molecule and a carbon dioxide molecule. If the reactiouroccurs quickly enough ( either it is hot enough or excess was poured), enough carbon dioxide will evolve to make it overflow.
HA = any acid
HA + NaHCO3 ----> H2CO3 + NaA
H2CO3 -------> H2O + CO2