A solution contains 0.050 M Ba2+ and 0.050 MCa2+. A solution containing fluoride ions is added to selectively precipitate one of the ions. At what concentration offluoride ions will a precipitate begin to form? What is the identity of the precipitate?
Ksp(BaF2) = 2.45 x 10-5
Ksp(CaF2) = 1.46 x 10-10