The following question is taken from a Chemistry Advanced Placement Examination and is used with the permission of the Educational Testing Service.
Solve the following problem:
MgF2(s) ⇌ Mg2+(aq) + 2F−(aq)
In a saturated solution of MgF2 at 18 °C, the concentration of Mg2+ is 1.21 × 10^–3 M. The equilibrium is represented by the preceding equation.
(c) Predict whether a precipitate of MgF2 will form when 100.0 mL of a 3.00 × 10–3-M solution of Mg(NO3)2 is mixed with 200.0 mL of a 2.00 × 10–3-M solution of NaF at 18 °C. Show the calculations to support your prediction.

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