Separating Ions by Selective Precipitation
Solution: Writing chemical equations and ion-product expressions:
AgI(s) Ag+(aq) + I -(aq) Ksp = [Ag+][I -]
CuI(s) Cu+(aq) + I -(aq) Ksp = [Cu+][I -]
H2O
H2O
Calculating the quantity of iodide needed to give a saturated solution
of CuI:
[I -] = = = 1.0 x 10-11 M
Ksp
[Cu+]
1.0 x 10-12
0.10 M
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