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Homework Help: Concentration of ion from Ksp

  1. Jul 4, 2016 #1


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    1. The problem statement, all variables and given/known data
    Screen Shot 2016-07-04 at 1.54.08 PM.png

    2. Relevant equations

    3. The attempt at a solution
    I am not too confident with my knowledge of Ksp so just checking my answer. Ksp = [Hg2+][S2-]

    Therefore root Ksp to get [Hg2+] = 1.2649*10-26. So answer is B. Is this right?

  2. jcsd
  3. Jul 4, 2016 #2


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    Staff: Mentor

    This is tricky (and to be honest, question is stupid).

    Yes, they expect answer B. No, it is not true, as S2- is a relatively strong base reacting with water to produce HS- and OH-, removing S2- and shifting the dissolution to the right (not to mention zilions of other side reactions between Hg2+ and water, but let's just stick with the most obvious one).
  4. Jul 4, 2016 #3


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    Haha, that is way above my level! Thanks!
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