4Al+3O2-->2Al2O3
Al2O3+6HCL-->2AlCL3+3H2O
2AlCL3+3H2SO4-->Al2(SO4)3+6HCL
Al2(SO4)3+6NaOH--->2Al(OH)3+3Na2SO4
2Al(OH)3-->Al2O3+3H2O
4Al+3O2-->2Al2O3
Al2O3+6HCL-->2AlCL3+3H2O
2AlCL3+3H2SO4-->Al2(SO4)3+6HCL
Al2(SO4)3+6NaOH--->2Al(OH)3+3Na2SO4
2Al(OH)3-->Al2O3+3H2O