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Topic: Solubility product of a substituted crystal  (Read 1067 times)

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Offline spagettimnstr

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Solubility product of a substituted crystal
« on: February 25, 2013, 07:57:28 PM »
Hi. I'm stumped on something in my homework that I feel like shouldn't be a major obstacle.

The problem takes the following form:

Calculate the Ksp for the Y-substituted crystal X.4Y.6Z given the Ksp values for:

XZ -> X+ + Z-

YZ -> Y+ + Z-


I can't figure out if I'm supposed to be doing some Hess's law-style combination of the two constituent solubility products, or if there's another approach that I'm missing altogether.

I understand that the Ksp of the substituted crystal should be [.4X].4[.6Y].6[Z] by doing an intial-change-equilibrium table, but again, I don't understand how to arrive at a numerical value. Thanks!

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