\underset{\text{formula equation}}{HC_2H_3O_2(aq) + NaOH(aq)}→NaC_2H_3O_2(aq) + H_2O(l)
\underset{\text{net ionic equation}}{HC_2H_3O_2 + OH^-→C_2H_3O^-_2 + H_2O}
Acetic acid, HC_2H_3O_2 a weak acid, is written in the molecular form, but sodium acetate,NaC_2H_3O_2 a soluble salt, is written in the ionic form. The Na^+ ion is the only spectator ion in this reaction. Both sides of the net ionic equation have a -1 electrical charge.