A solution containing a mixture of metal cations was treatedwith dilute HCl and a precipitate formed. The solution was filteredand H2S was bubbled through the acidic solution. A precipitateagain formed and was filtered off. Then, the pH was raised to about8 and H2S was again bubbled through the solution. This time, noprecipitate formed. Finally, the solution was treated with a sodiumcarbonate solution, which resulted in formation of a precipitate.Which metal ions were definitely present, which were definitelyabsent, and which may or may not have been present in the originalmixture? Ag+, Zn2+, Co2+, Li+, Cu2+, Ca2+, Fe2+, Sn2+, Mg2+, Hg22+Sb3+, Hg2+, Pb2+
