Answer:
Option The solid phase is relatively soluble.
Step-by-step explanation:
The solubility constant of an ionic solid is given as an expression of the extent to which a substance can be soluble. The ratio is known as the solubility product constant and is given by the general expression:
![K_(sp) = ([products])/([ reatants])](https://img.qammunity.org/2017/formulas/physics/high-school/385jijdnmjvvvz7d79g7ftd73yfsjeqyrq.png)
where [ products] is the concentration of the products and [reactants] the concentration of the reactants.
A typical ionic reaction:

has the Ksp = [Ba²⁺][SO₄²⁻]