A Solution of NaF Is Added Dropwise to a Solution

Multiple Choice

A solution of NaF is added dropwise to a solution that is 0.0122 M in Ba²⁺. When the concentration of F^- exceeds ________ M, BaF₂ will precipitate. Neglect volume changes. For BaF, Ksp = 1.7 × 10^-6.

A) 7.0 × 10^-5
B) 1.2 × 10^-2
C) 2.1 × 10^-8
D) 3.0 × 10^-3
E) 1.4 × 10^-4