Question

K2SO4(aq) + Ba(NO3)2(aq) → 2KNO3(aq) + BaSO4(s)

Answer 1

That would be BaSO4(s)     ( s  means solid)

Answer 2

Answer:

$BaSO_{4(s)}$

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 $(KNO_{3(aq)} )$ remains in solution owing to the state are (aq) that means aqueous. Barium sulfate $(BaSO_{4(s)})$, 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 $BaSO_{4(s)}$.

Rgds!