Neutralization reactions occur when an acid and a base react in stoichiometric amounts to form a salt and water. In this case, HC2H3O2 (acetic acid) is an acid and NaHCO3 (sodium bicarbonate) is a base. The products of the reaction are NaC2H3O2 (sodium acetate), H2CO3 (carbonic acid), and H2O (water).