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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?

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?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Ag*, Pbt, Hg5* form insoluble chlorides Bi3+, Cd2+, Cu²+, Hg²+, Pb2+, Sb³+, Sn²+, Sn+ form acid-insoluble sulfides Al3+, Co2+, Cr³+, Fe2+, Fe3+, Ni²+, Mn²+, Zn²+ form base-insoluble sulfides or hydroxides Ba?+, Ca?+, Mg²+, Sr²+ form insoluble carbonates Lit, Na*, K*, NH completely soluble Answer Bank All of these ions were present. unknown None of these ions were present. At least one of these ions was present.
Transcribed Image Text:Ag*, Pbt, Hg5* form insoluble chlorides Bi3+, Cd2+, Cu²+, Hg²+, Pb2+, Sb³+, Sn²+, Sn+ form acid-insoluble sulfides Al3+, Co2+, Cr³+, Fe2+, Fe3+, Ni²+, Mn²+, Zn²+ form base-insoluble sulfides or hydroxides Ba?+, Ca?+, Mg²+, Sr²+ form insoluble carbonates Lit, Na*, K*, NH completely soluble Answer Bank All of these ions were present. unknown None of these ions were present. At least one of these ions was 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+, Pb?+, Hgž+ form insoluble chlorides Bit, Cd²+, Cu²+, Hg²+, Pb2+, Sb3+, Sn²+, Sn+ form acid-insoluble sulfides Al3+, Co2+, Cr+, Fe²+, Fe3+, Ni2+, Mn2+, Zn2+ form base-insoluble sulfides or hydroxides Ba?+, Ca?+, Mg²+, S²+ form insoluble carbonates Lit, Nat, K+, NH completely soluble
Transcribed Image Text: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+, Pb?+, Hgž+ form insoluble chlorides Bit, Cd²+, Cu²+, Hg²+, Pb2+, Sb3+, Sn²+, Sn+ form acid-insoluble sulfides Al3+, Co2+, Cr+, Fe²+, Fe3+, Ni2+, Mn2+, Zn2+ form base-insoluble sulfides or hydroxides Ba?+, Ca?+, Mg²+, S²+ form insoluble carbonates Lit, Nat, K+, NH completely soluble
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