A solution is prepared by adding some solid BaF2 to water and allowing the solid to come to equilibrium with the solution. The equilibrium constant for the reaction below is Kc = 1.3x10-6.
BaF2(s) → Ba2+(aq) + 2 F -(aq)
What is the equilibrium concentration of Ba2+ in the solution? Assume some of the solid is still present.