....................CdS ==> Cd^2+ + S^2-
initial.............solid..........0.............0
change..........solid..........x..............x
equil...............solid..........x..............x
Ksp = (Cd^2+)(S^2-)
Ksp = (x)(x)
Look up Ksp for CdS and solve for x which will be in mols/L. Post your work if you get stuck. You don't say in how much water, if you want grams or some other unit.
calculate the solubility of cds in H2O
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