In this equation. These guys only count because they're both atreus. Remember, we never count solids and we never count liquids. Therefore, KSP is equal to the concentration of barium times the concentration of sulfate ion. Finally, since this guy is 1.0 times cents and negative ten, we say KSP is equal to 1.0 times ten to negative ten equals. Now, since this is X and this is X, you write X is here.