Question

Al(NO3)3 -> Al(OH)3 ->Al2(SO4)3 -> BaSo4

Answer 1

Al(NO3)3+3NaOH-->Al(OH)3+3NaNO3

2Al(OH)3+H2SO4-->Al2(SO4)3+4H2O

Al2(SO4)3+3BaCL2-->3BaSO4+2AlCL3