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A solution containing a mixture of metal cations was treated with dilute HCl and a precipitate formed. The solution was filtered and H2S was bubbled through the acidic solution. A precipitate again formed and was filtered off. Then, the pH was raised to about 8 and H2S was again bubbled through the solution. This time, no precipitate formed. Finally, the solution was treated with a sodium carbonate solution, which resulted in formation of a precipitate. Which metal ions were definiately present, which were definately absent, and which may or may not have been present in the original mixture? Al3+, Sn2+, K+, Mg2+, (Hg2)2+, Ag+, Bi3+, Pb2+, Mn2+, Cu2+, Ni2+, Hg2+, Ba2+

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