Question

Al2O3=Al2(SO4)2=Al(OH)3=Al2O3

Answer 1

1) Al2O3 + 3 SO3 → Al2(SO4)3

2)Al2(SO4)3 + 6 NaOH → 3 Na2SO4 + 2 Al(OH)3

3) 2 Al(OH)3 → Al2O3 + 3 H2O