A large number of ingredients in cola are H2CO3, that is, carbonic acid. After salt (NaCl) is put into cola (H2O water), part of it can be electrolyzed into CLˉ, and chloride ions can react with carbonic acid to produce CO2 gas, that is, bubbles. (This process is a salting-out phenomenon)

salt out

Salting out generally refers to the process of adding inorganic salts to the solution to reduce the solubility of a substance and precipitate it. For example, the process of condensing protein by concentrating (NH 4) 2SO 4; Adding saturation to the esterification reaction of acetic acid to ethyl acetate? Sodium carbonate solution reduces the solubility of ethyl acetate and makes its stratification phenomenon more obvious.