A solution containing a mixture of metal cations was treated as follows. 1. Dilute HCl was added and a precipitate formed. The precipitate was filtered off. 2. H, S was bubbled through the acidic solution. Again, a precipitate formed and was filtered off. 3. The pH was raised to about 9 and H,S was again bubbled through the solution. No precipitate formed. 4. Finally, sodium carbonate was added and no precipitate formed. What can be said about the presence of each of these groups of cations in the original solution? Cation Group Description Present in the original solution? Ag*, Pb²+, Hgž+ form insoluble chlorides Bi³+, Cd2+, Cu²+, Hg²+, Pb2+, Sb³+, Sn²+, Snª+ form acid-insoluble sulfides Al3+, Co2+, Cr³+, Fe²+, Fe3+, Ni²+, Mn²+, Zn²+ form base-insoluble sulfides or hydroxides Ba?+, Ca2+, Mg²+, Sr²+ form insoluble carbonates Li*, Na*, K*, NH completely soluble Answer Bank unknown At least one of these ions was present. None of these ions were present. All of these ions were present.

A solution containing a mixture of metal cations was treated as follows. 1. Dilute HCl was added and a precipitate formed. The precipitate was filtered off. 2. H, S was bubbled through the acidic solution. Again, a precipitate formed and was filtered off. 3. The pH was raised to about 9 and H,S was again bubbled through the solution. No precipitate formed. 4. Finally, sodium carbonate was added and no precipitate formed. What can be said about the presence of each of these groups of cations in the original solution? Cation Group Description Present in the original solution? Ag, Pb²+, Hgž+ form insoluble chlorides Bi³+, Cd2+, Cu²+, Hg²+, Pb2+, Sb³+, Sn²+, Snª+ form acid-insoluble sulfides Al3+, Co2+, Cr³+, Fe²+, Fe3+, Ni²+, Mn²+, Zn²+ form base-insoluble sulfides or hydroxides Ba?+, Ca2+, Mg²+, Sr²+ form insoluble carbonates Li, Na, K, NH completely soluble Answer Bank unknown At least one of these ions was present. None of these ions were present. All of these ions were present.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter19: The Chemistry Of The Main-group Elements

Section: Chapter Questions

Problem 88QRT

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