A ground water source contains 2.5 mg of F- ion per liter.
a) what is the concentration of F- ions in moles per liter?
b) will CaF2 (Ksp = 2E-10) precipitate when the concentration of Ca2+ = 5.0E-3M?

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  1. mols F^- = 0.0025g/atomic mass F and since that is is 1 L, that is the concn in mols/L.
    Evaluate Qsp and compare with Ksp.

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