Map Sapling Learning A solution containing a mixture of metal cations was treate

Question

Map Sapling Learning A solution containing a mixture of metal cations was treated with dilute HCl 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? x Definitely absent Possibly present Ag Ca2' cu21 Mn The complete protocol and a list of possible Sn precipitates can be found here. Fe Mg Hg2r Sbr Co Hg Pb

Explanation / Answer

Solution of cation + HCl = precipitate form

Thus there are first group metal cations Ag+. Hg2^2 and Pb2+ present

Now add H2S in acidic medium = precipitate form

Thus there are 2nd group metal cations Cu2+, Cd2+, Sn2+ and Bi3+ present

Now H2S in basic medium = no precipitate form

Thus there are Co2+, Fe2+, Mn2+, Ni2+, Zn2+, Al3+ and Cr3+ absent

Now H2S in basic medium + Na2CO3 = precipitate form

Thus there are Ba2+, Ca2+ and Sr2+ present.

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