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 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? Definitely presentDefinitely absentPossibly present 92A g Sb3+ 2+

Explanation / Answer

Definitely present                Definitely absent                                                         possible present

Ag^+, Hg22+ ,Pb^2+ ,Cu^2+, Hg^2+     Zn^2+, Fe^2+, Cr^3+                                       K^+

Sb^3+, Sn^2+, Ba^2+ , Mg^2+

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