Question

A 0.10 M solution of fluoride ions is gradually added to a solution containing Ba2 , Ca2 , and Pb2 ions, each at a concentration of 1 x 10-3 M. In what order, from first to last, will the precipitates of BaF2, CaF2, and PbF2 form

Answer 1

PbF2, BaF2 and CaF2

due to the fact that lead has a higher value of solubility product,

lead fluoride will precipitate first