What is the concentration of \( \mathrm{Ba}^{2+} \) when \( \mathrm{BaF}_{2}\left(K_{s p}=1.0 \t...

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What is the concentration of \( \mathrm{Ba}^{2+} \) when \( \mathrm{BaF}_{2}\left(K_{s p}=1.0 \times 10^{-6}\right) \) begins to precipitate from a solution that is \( 0.30 \mathrm{M} \mathrm{F}^{-} \)?
(a) \( 9.0 \times 10^{-7} \)
(b) \( 3.3 \times 10^{-5} \)
(c) \( 1.1 \times 10^{-5} \)
(d) \( 3.0 \times 10^{-7} \)
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