In a qualitative analysis procedure, a chemist adds HCl to an unknown group of ions and then saturates the solution with H2S so that the solution is 0.2 M in HCl and 0.10 M in H2S.
(a) What is the [HS -] of the solution? (Note: The answer should have one significant figure.)
(b) If 0.01 M of each of the following ions is in the solution, which will form a precipitate? (Select all that apply.)
Cu2+ Mn2+ Pb2+ Ag+ Hg2+ Fe2+ Ni2+ K+