What concentration of SO32– is in equilibrium with Ag2SO3(s) and 2.10 × 10-3 M Ag ? The Ksp of Ag2SO3=1.50×10–14

Answer 1

...........Ag2SO3 ==> 2Ag^+ + SO3^2-
I.......................0.......0
C......................2x.......x
E.....................2x........x

Ksp = (Ag^+)^2(SO3^2-)
The problem gives you (Ag+) = 0.0021; substitute that into Ksp expression along with Ksp and solve for x = (SO3^2-)