Transcribed Image Text: A solution containing a mixture of metal cations was treated with dilute HCl and no precipitate formed. Next, H,S was
bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the pH was raised to about 8 and H,S
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.
Classify the metal ions based on whether they were definitely present, definitely absent, or whether it is possible they were
present in the original mixture.