Answer:
[tex]BaSO_{4(s)}[/tex]
Explanation:
The chemical reaction presented above represents a precipitation reaction where interacts two solutions as a reactants and produce two products. When you want to know if the products remain in solution or precipitate as a solid you could concentrate your attention in the states of the different compounds, represented for subscript of letters in a parenthesis.
In the present exercise the potassium nitrate [tex](KNO_{3(aq)} )\\[/tex] remains in solution owing to the state are (aq) that means aqueous. Barium sulfate [tex](BaSO_{4(s)})[/tex], by contrast, will precipitate out because of its state is (s) that means solid.
In summary, the state of compounds helps recognizing the precipitate in a reaction. For this case, the precipitate is [tex]BaSO_{4(s)}[/tex].
Rgds!
