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, 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 original mixture? Definitely presentDefini tely absent Possibly present Cu Pb2 Ba2*

Explanation / Answer

Possibly present

Cations which precipitate with HCl are: Ag+, Hg22+ and Pb2+

Cations which precipitate with H2S are: Cd2+, Bi2+,

Cations which precipitate with Na2CO3: Ba2+, Zn2+, Co2+, Mg2+, Hg2+,

Definitely absent

Fe2+

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