The solubility of CaF2 (s) [Ksp= 4.0 x 10 -11] in 1.0 L of a 1.0 x 10 -2 M solution of NaF is:
A. 4.0 x 10 -9 moles
B. 1.0 x 10 -7 moles
C. 7.0 x 10 -4 moles
D. 4.0 x 10 -7 moles
E. none of these
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