Question

Al-Al2O3-AlCl3-Al(OH)3-Al2(SO4)3-Al(OH)3

Answer 1

$\boxed{\bf Al \to Al_2O_3 \to AlCl_3 \to Al(OH)_3 \to Al_2(SO_4)_3 \to Al(OH)_3}$
$\tt 1) ~4Al + 3O_2 \to 2Al_2O_3.$

$\tt 2)~Al_2O_3 + 6HCl \to 2AlCl_3 + 3H_2O.$

$\tt 3)~AlCl_3 + 3NaOH \to Al(OH)_3\downarrow + 3NaCl.$

$\tt 4)~2Al(OH)_3 + 3H_2SO_4 \to Al_2(SO_4)_3 + 6H_2O.$

$\tt 5)~Al_2(SO_4)_3 + 6NaOH \to 2Al(OH)_3\downarrow + 3Na_2SO_4.$