(1) \(4Al+3O_2-t^o-2Al_2O_3\)
(2) \(Al_2O_3+6HCl-->2AlCl_3+3H_2O\)
(3) \(AlCl_3+3AgNO_3-->3AgCl\downarrow+Al\left(NO_3\right)_3\)
(4) \(Al\left(NO_3\right)_3+3NaOH-->3NaNO_3+Al\left(OH\right)_3\downarrow\)
(1) \(4Al+3O_2-t^o->2Al_2O_3\)
(2) \(Al_2O_3+6HCl-->2AlCl_3+3H_2\uparrow\)
(3) \(AlCl_3+3NaOH-->Al\left(OH\right)_3\downarrow+3NaCl\)