Posted by Evie on Thursday, May 12, 2011 at 8:33pm.
FeS ==> Fe^2+ + S^2-
Ksp = (Fe^2+)(S^=)
Look up the Ksp for FeS, set up an ICE chart, substitute into the Ksp expression and solve for the solubility.
What is an ICE chart?
If we let x stand for the solubility of FeS, then x is the concn of iron(II) and x is the concn of S^2-.
................FeS ==> Fe^2+ + S^2-
initial...................0......0
change....................x.......x
equil.....................x.......x
I stands for initial
C stands for change
E stands for equilibrium.
I have set one up above for you.
So you substitute x for (Fe^2+) and x for (S^2-), and whatever you find in your text for Ksp FeS, and solve for x.
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