\(n_{HCl}=\dfrac{400.18,25\%}{36,5}=2\left(mol\right)\\ n_{Ba\left(OH\right)_2}=0,25.2=0,5\left(mol\right)\\ Ba\left(OH\right)_2+2HCl\rightarrow BaCl_2+2H_2O\\ 0,5...............1...............0,5\left(mol\right)\\ NaOH+HCl\rightarrow NaCl+H_2O\\ 1............1..............1\left(mol\right)\\ C\%_{ddNaOH}=\dfrac{1.40}{120}.100\approx33,333\%\)