Chemistry - Dissolving Precipitates

[Jeann25]

Homework Statement

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).

Homework Equations

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?

 

[Borek]

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

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

NaCl in net ionic?