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Why is there S in this question

  1. Jan 21, 2016 #1

    TT0

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    1. The problem statement, all variables and given/known data
    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

    2. Relevant equations
    -

    3. 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!
     
  2. jcsd
  3. Jan 21, 2016 #2

    Bystander

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    You're certain you haven't omitted "following precipitation with H2S?"
     
  4. Jan 22, 2016 #3

    TT0

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    Yep
     
  5. Jan 22, 2016 #4

    Bystander

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    We'll mark that down to an "oversight."
     
  6. Jan 22, 2016 #5

    TT0

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    Ok thanks!
     
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