A solution containing a mixture of metal cations was treated with dilute HCl and

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 definately present, which were definitely absent, and which may or may not have been present in the orginal mixture?

Co^+2, Ni^+2, Zn^+2, Ba^+2, K^+, Sn^+4, Ag^+, Pb^+2, Hg2^+2, Mg^+2, Cu^+2, Hg^+2, Sb^+3

Please categorize those into the following categories:

Definitely absent:

Possibly present:

Definitely present:

Explanation / Answer

definitely not presen:Pb+2 , Ag+ , Hg2+2( they form ppt with HCl),

Mg+2 , Ba+2 (form [ppt with carbonate)

Definitely present: Hg+2 , , Sn+4, Sb+3 (ppt in acidic H2S),

Fe+3, Ni+2 , Zn +2 , Co+2 (ppt in basic H2S) ,

May be: K+ (soluble in carbonate)

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.