Why is Sulfur Mentioned in Qualitative Analysis of Hg+2 and Cu+2?

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In qualitative analysis, the separation of Hg+2 from Cu+2 involves the addition of 3M HNO3, primarily because HgS is less soluble than CuS in this acidic solution. The mention of sulfur arises from the precipitation of HgS when hydrogen sulfide (H2S) is introduced, which is crucial for distinguishing between the two ions. The confusion stems from the assumption that sulfur is present without recognizing its role in the precipitation process. The correct understanding is that the sulfur atom is involved in the formation of HgS during the analysis. This highlights the importance of recognizing chemical interactions in qualitative analysis.
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Homework Statement


In qualitative analysis, Hg+2 can be separated from Cu+2 by the addition of 3M HNO3 because

A. Cu(NO3)2 is less soluble than Hg(NO3)2
B. Hg(NO3)2 is less soluble than Cu(NO3)2
C. HgS is less soluble than CuS in 3M HNO3
D. CuS is less soluble than HgS in 3M HNO3
E. Hg+2 is oxidized by 3M HNO3, whereas Cu+2 is not

Homework Equations


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The Attempt at a Solution


The answer is C but I don't understand how there is a S atom in the solution. Is there something I am missing?

Thanks!
 
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You're certain you haven't omitted "following precipitation with H2S?"
 
Yep
 
We'll mark that down to an "oversight."
 
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Ok thanks!
 
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