Sapling Learning Map A solution containing a mixture of metal cations was treate
ID: 552995 • Letter: S
Question
Sapling Learning Map 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 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? Possibly preset Ag Ca2* Co2* Cu2+ Mn2* Sn Fe 2+ K* Pb2 Hgz2 Sb3 Incorrect.Explanation / Answer
Answer
Definitly Absent : Ag+ , Pb2+, Hg22+, Ca2+ and Mg2+
May or may not present : K+ and Fe2+
Possibly present : Cu2+, Mn2+ ,Co2+ , Sn2+, Hg2+ and Sb3+
Explanation
Group seperation of Cations is the basic to solve this problem
In the given experiment , 3 group analysis done
group 1 : Treatment with HCl, If precipitate form cations like Ag+ ,Pb2+,Hg22+ may be present
group 2 : H2S bubbling in acidic condition, If precipitate form cations like Cu2+ ,Sb3+ ,Hg2+,Sn2+ may be present
group 4: H2S bubbling in basic condition, if precipitate form Cations like Mn2+ ,Co2+ may be present
group 5: Sodium Carbonate, if precipitate form Cations like Ca2+ , Mg2+ may present
In the given experiment
No precipitate in Group1 and Group5: Definetly absence of Ag+ , Pb2+ , Hg22+, Ca2+, Mg2+
Precipitate in group 2 and 4: Cu2+ , Mn2+ , Sn2+ , Sb3+, Hg2+,Co2+ may be present
remaining ions are Fe2+ and K+ their group analysis not done so, this ions may or may not be present
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