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Homework Help: Chemistry - Dissolving Precipitates

  1. Apr 1, 2007 #1
    1. The problem statement, all variables and given/known data

    Write an overall net ionic equation and calculate K for the reaction where CuCl (Ksp = 1.9 x 10^-7) is dissolved by NaCN to from [Cu(CN)2]- Kf = 1.0 x 10^16).

    2. Relevant equations

    3. The attempt at a solution

    The net ionic equation I've come up with is:

    CuCl + Na(CN)2- --> Cu(CN)2- + NaCl

    The equilibrium equations to figure K that I came with are:

    CuCl --> Cu+ + Cl-
    2CN- + Cu+ --> [Cu(CN)2]-

    Am I on the right track here, or am I completely off? How would I then determine K from this? How do I know when it's 1/Ksp or just Ksp?
  2. jcsd
  3. Apr 1, 2007 #2


    User Avatar

    Staff: Mentor

    NaCl in net ionic?

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