Including activity coefficients, find [Cu2+] in saturated Cu(IO3)2 in 0.175 M NaIO3. The solubility of Cu(IO3)2 is small, so the concentration of IO3− is 0.175 M from NaIO3.
The Ksp for Cu(IO3)2 is 1.4 x 10−7, the hydrated radii (α) are 600 pm for Cu2+ and 450 pm for IO3−, and the ionic strength of the solution (μ) is 0.175 M (YOU do not have to calculate this).