Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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A solution containing a mixture of metal cations was treated as outlined.
- Dilute HClHCl was added and a precipitate formed. The precipitate was filtered off.
- H2SH2S was bubbled through the acidic solution. No precipitate formed.
- The pH was raised to about 9 and H2SH2S was again bubbled through the solution. A precipitate formed and was filtered off.
- Finally, sodium carbonate was added to the filtered solution and no precipitate formed.
What can be said about the presence of each of these groups of cations in the original solution?
Transcribed Image Text:A solution containing a mixture of metal cations was treated as outlined.
1. Dilute HCl was added and a precipitate formed. The precipitate was filtered off.
2. H₂S was bubbled through the acidic solution. No precipitate formed.
3. The pH was raised to about 9 and H₂S was again bubbled through the solution. A precipitate formed and was filtered off.
4. Finally, sodium carbonate was added to the filtered solution and no precipitate formed.
What can be said about the presence of each of these groups of cations in the original solution?
Cation group
Ag+, Pb²+, Hg²+
Bi³ +, Cd²+, Cu²+,
Pb²+, Sb³ +, 2 + 4+
Sn² Snª
9
2 +
9
Hg²
Al³+, Co²+, Cr³+, Fe²+,
Fe³+, Ni²+, Mn²+, Zn²+
Ba²+, Ca²+, Mg²+, Sr² +
Li+, Na+, K+, NH
At least one of these ions was present.
Description
form insoluble chlorides
form acid-insoluble sulfides
form base-insoluble sulfides
or hydroxides
form insoluble carbonates
completely soluble
Answer Bank
All of these ions were present.
Present in the original solution?
At least one of these ions was present.
None of these ions were present.
At least one of these ions was present.
At least one of these ions was present.
unknown
None of these ions were present.
unknown
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