A solution containing a mixture of metal cations was treated as outlined. Dilute HCl was added and a precipitate formed. The precipitate was filtered off.
H2S was bubbled through the acidic solution. No precipitate formed.
The pH was raised to about 9 and H2S was again bubbled through the solution. A precipitate formed and was filtered off.
Finally, sodium carbonate was added to the filtered solution. A precipitate formed and was filtered off.
What can be said about the presence of each of these groups of cations in the original solution?
Options: None of these ions were present
At least one of these ions was present
All of these ions were present
Unknown