Assuming the complete dissociation of HCl and the lead salt, determine how much HCl is to be added to a 0.001 M lead salt solution to just prevent precipitation when saturated with the H2S. The concentration of H2S in its saturated solution is 0.1 M.
Ksp (PbS) = 3.4 x10-28
Ka (H2S) = 1.1x 10-23