Amount of Ca2+ left...?

When blood is donated, sodium oxalate solution is used to precipitate the Ca2+, which triggers clotting. A 104 mL sample of blood contains 9.7x10^-5 g Ca2+/mL. A technologist treats the sample with 110.0 mL of 0.2210 M Na2C2O4. Calculate the concentration of Ca2+ after the treatment. (Ksp of CaC2O4 = 2.3x10^-9)