\underset{\text{formula equation}}{Na_2CO_3(aq) + H_2SO_4(aq)}→Na_2SO_4(aq) + H_2O(l) + CO_2(g)
\underset{\text{net ionic equation}}{CO^{2-}_3 + 2 H^+}→H_2O(l) + CO_2(g)
Carbon dioxide (CO_2) is a gas and evolves from the solution; Na^+ and SO^{2-}_4 are spectator ions.