The reaction of silver nitrate (AgNO3) and barium chloride (BaCl2) results in the formation of a white precipitate. This precipitate is barium nitrate (Ba(NO3)2), which is insoluble in water. The overall reaction can be represented as follows:

AgNO3 (aq) + BaCl2 (aq) → Ba(NO3)2 (s) + 2AgCl (s)

In this reaction, silver nitrate and barium chloride exchange their anions to form barium nitrate and silver chloride. Silver chloride is also a white precipitate, but it is less soluble in water than barium nitrate. Therefore, the predominant precipitate in this reaction is barium nitrate.