A solution containing a mixture of metal cations was treated with dilute HCl and

Question

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 definitely present, which were definitely absent, and which may or may not have been present in the original mixture?

Which ions are definitely present, definitely absent, or possibly present?

Pb2+, Ba2+, Mn2+, Fe2+, Co2+, Sn2+, Li+, Mg2+, Hg2 2+, Ag+, Sb3+, Cu2+, Hg2+

Explanation / Answer

Precipitates with HCl (Pb2+, Ag2+, Hg2+),

Precipitates with H2S (Mn2+, Fe2+, Co2+, Sn2+, Cu2+)

Possibly present, beause they are soluble with the H2S or acid, Ba2+, Li+, Sb3+

Absent: Hg22+

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