When barium chloride (BaCl2) is added to aluminum sulfate (Al2(SO4)3), a chemical reaction takes place resulting in the formation of barium sulfate (BaSO4) and aluminum chloride (AlCl3). The balanced chemical equation for this reaction is:

3BaCl2(aq) + Al2(SO4)3(aq) → 3BaSO4(s) + 2AlCl3(aq)