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

Question

A solution containing a mbdure of metal cations was treated with dilute HCI and na preciptate formed. Next, H2S was bubbled through the acidic solution. A precipitata formed and was fitered off. Then, the pH was raised to about 8 and H2S was again bubbled through the solution. A precipitate again forned 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? Definitely presentDefinitely absentPossibly present ?Previous ®Give Up & View Solution @check Answer?Next ?xi- Hint about us careers privacy policy terma of use contact us

Explanation / Answer

WITH DILUTE HCl NO PRECIPITATE FORMED ( METAL ABSENT ARE Ag+, Pb2+, Hg22+)

H2S GAS IN ACIDIC MEDIUM FORM PRECIPITATE METAL MAY BE

, Cd2+, Hg2+, Sb3+

H2S GAS IN basic MEDIUM FORM PRECIPITATE METAL MAY BE

(Zn2+, CO2+)

with sodium carbonate no precipitate formed ( Ba2+) absent

  

DEFINETLY ABSENT-  Ag+, Pb2+, Hg22+, Ba2+,

DEFINETLY PRESENT - Zn2+, CO2+,  Cd2+, Hg2+, Sb3+

MAY BE PRESENT NO TEST DONE = K+, Mg2+, Fe2+, Sn4+

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