(1) \(2Al+2NaOH+2H_2O\rightarrow2NaAlO_2+3H_2\uparrow\)
(2) \(NaAlO_2+HCl+H_2O\rightarrow NaCl+Al\left(OH\right)_3\)
\(2Al\left(OH\right)_3+6HCl\rightarrow2AlCl_3+3H_2O\)
(3) \(3Ba\left(OH\right)_2+2AlCl_3\rightarrow3BaCl_2+2Al\left(OH\right)_3\)
\(2Al\left(OH\right)_3+Ba\left(OH\right)_2\rightarrow Ba\left(AlO_2\right)_2+4H_2O\)
(4) \(Ba\left(AlO_2\right)_2+2HCl+2H_2O\rightarrow BaCl_2+2Al\left(OH\right)_3\)