NaHCO3(aq) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq) The formation of yellow bubbles indicates an acidic gas is formed (H2CO3 this comes from the interaction of CO2 + H2O → H2CO3). The solution is red in color, therefore, the salt (NaC2H3O2) in the solution is basic
