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

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In summary, qualitative analysis shows that adding 3M HNO3 separates Hg+2 from Cu+2. This is because Hg(NO3)2 is less soluble than Cu(NO3)2 and HgS is less soluble than CuS in 3M HNO3. Additionally, Hg+2 is oxidized by 3M HNO3 while Cu+2 is not. This helps to differentiate between the two ions. However, there is a possibility of S atoms being present in the solution, which may affect the solubility of the compounds.
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TT0
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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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  • #2
You're certain you haven't omitted "following precipitation with H2S?"
 
  • #3
Yep
 
  • #4
We'll mark that down to an "oversight."
 
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  • #5
Ok thanks!
 

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

Why is there an "S" in this question?

The letter "S" is used in this question because it is the subject of the sentence. It is typically used to refer to something or someone, and in this case, it is referring to the word "question".

What does the "S" stand for in this question?

The "S" in this question stands for the subject, which is the main focus of the sentence. It could also stand for the word "something" or "someone" depending on the context of the question.

Why is the letter "S" capitalized in this question?

In English grammar, the subject of a sentence is typically capitalized. This is to distinguish it from other parts of the sentence and to give it emphasis as the main focus.

Is the "S" in this question a part of speech?

Yes, the "S" in this question is a part of speech. It is a noun, specifically a subject noun, which is used to refer to something or someone in a sentence.

Can the "S" in this question be replaced with another letter?

Yes, the "S" in this question can be replaced with another letter as long as it still serves as the subject of the sentence. For example, "Why is there a "T" in this question?" would still be a grammatically correct sentence.

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