Answer : The net ionic equation will be,
[tex]2H^+(aq)+2OH^-(aq)\rightarrow 2H_2O(l)[/tex]
Explanation :
In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The given balanced ionic equation will be,
[tex]2HClO_4(aq)+Ba(OH)_2(aq)\rightarrow Ba(ClO_4)_2(aq)+2H_2O(l)[/tex]
The ionic equation in separated aqueous solution will be,
[tex]2H^+(aq)+2ClO_4^-(aq)+Ba^{2+}(aq)+2OH^-(aq)\rightarrow 2H_2O(l)+Ba^{2+}(aq)+2ClO_4^-(aq)[/tex]
In this equation, [tex]ClO_4^-\text{ and }Ba^{2+}[/tex] are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,
[tex]2H^+(aq)+2OH^-(aq)\rightarrow 2H_2O(l)[/tex]