(1)\(Al_2\left(SO_4\right)_3+6HCl\rightarrow2AlCl_3+3H_2SO_4\)
(2)\(AlCl_3+3NaOH\rightarrow Al\left(OH\right)_3+3NaCl\)
(3)\(Al_2\left(SO_4\right)_3+6NaOH\rightarrow2Al\left(OH\right)_3+3Na_2SO_4\)
(4)\(2Al\left(OH\right)_3+3Na_2SO_4\rightarrow Al_2\left(SO_4\right)_3+6NaOH\)
(5)\(2Al\left(OH\right)_3+3Na_2O\rightarrow Al_2O_3+6NaOH\)
(6)\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)
(1)\(2Zn+O_2\rightarrow2ZnO\)
(2)\(ZnO+H_2\rightarrow Zn+H_2O\)
(3)\(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)
(4)\(ZnCl_2+2NaOH\rightarrow Zn\left(OH\right)_2+2NaCl\)
(5)\(Zn\left(OH\right)_2+2NaCl\rightarrow ZnCl_2+2NaOH\)
(6)\(Zn\left(OH\right)_2\rightarrow^{t^o}H_2O+ZnO\)
