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 no precipitate formed Next, H2S was bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the phH was raised to about 8 and H2S 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 orginal mixture? Definitely absent Possibly present

Explanation / Answer

The metal ions which form insoluble precipitate with HCl are Hg2^2+ , Hg^2+ , Ag+ and Pb^2+. But, since no precipitate forms we can say that Hg2^2+ , Hg^2+ , Ag+, Pb2+ are definitely absent.

Ba2+ and Ca2+ are also definitely absent becuase they don't form precipitate when CO3^2- is added.

None of the listed atoms are definitely present, as the information given is too limited to tell.

Rest of the ions which are,

Cr2+, Sn4+, Li+, Mg2+, Bi3+, Zn2+, Cd2+, Ni2+, are all possibly present.

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