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

Question

A solution containing a mixture of metal cations was treated with dilute HCI and no precipitate formed Next. H_2S was bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the pH was raised to about 8 and H_2S was again bubbled through the solution. A precipitate again formed and was filtered off. Finally, the solution was treated with a sodium carbonate solution, which resulted in no precipitation. Which metal ions were definitely present, which were definitely absent, and which may or may not have been present in the original mixture?

Explanation / Answer

Definitely present: Cu2+, Sb3+, Pb2+, Hg 2+

Definitely absent: Sn 2+ (because only precipitates Sn+ in H2S), Hg2 +2Ag (Ag and Hg2 precipitates with HCl)

Possibily present:, Ba2+, Li+, Mg2+, Co2+, Zn2+, N2+

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