H2SO4+BaCl2

The equation you provided is the reaction between sulfuric acid (H2SO4) and barium chloride (BaCl2).

H2SO4 + BaCl2 -> BaSO4 + 2HCl

In this reaction, sulfuric acid reacts with barium chloride to produce barium sulfate (BaSO4) and hydrochloric acid (HCl).