Ksp of CaF2 = 3.9*10^-11
At equilibrium:
CaF2 <----> Ca2+ + 2 F-
s 2s
Ksp = [Ca2+][F-]^2
3.9*10^-11=(s)*(2s)^2
3.9*10^-11= 4(s)^3
s = 2.136*10^-4 M
Answer: 2.1*10^-4 M
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