Question

What is the molar solubility of CaF2 if o,1o mol of NaF are added to 1.0L of a saturated solution of CaF2? The Ksp for CaF2 is 4.0 x 10^11.

I get 4,0 x 10^9. Is this right?
Surely you made a typo with Ksp. Surely it is 4.0 x 10^-11 and not +11.
S then is 4.0 x 10^-9 M (not +9)
4.0 x 10^-5

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