A solution containing a mixture of metal cations was treated with dilute HCl and
ID: 933861 • Letter: A
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 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 original mixture?
Hg2+, Ba2+,Zn2+, Fe2+, Cr3+, Li+, Mg2+, Pb2+,Hg2^2+, Ag+, Cd2+, Sn4+, Sb3+
Explanation / Answer
the first group metals precipitate with the presence of dil HCl. there is no precipitate absence of metal ions are-Ag+,Hg2^2+,Pb2+.
the solution containing second group metal ions precipitate with H2S-ions presence of ions in the solution are -Hg2+,Sn4+,Sb3+,Cd2+
in basic soltion third group cations precipitate - here precipitate is obtained.presence of ions in the solution are-Cr3+,Fe2+,Zn2+
with sodium carbonate solution 4th group metal ions precipitate- no precipitate absence of metal ions are-Ba2+,Mg2+
5th group ions may or may not present in the solution -Li+
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