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

Question

A solution containing a moture of metal cations was treated with dilute HCI and no precipiate formed. Next, HS was bubbled through the acidic solution. A precipitate formed and was iltered off. Then, the pH 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 Sn4* Ni2 Sb

Explanation / Answer

Definitely present - Hg+2 , Cd+2 , Sn+4 , Sb+3 ,  Fe+3 , Cr+2 , Zn +2

Definitely absent - Pb+2 , Ag+ , Hg2+2 , Mg+2 , Ba+2

May or may not be present - K+ . Mn+2 , Ni+2

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