What is the concentration of Ba^(2+) whe...

What is the concentration of `Ba^(2+)` when `BaF_(2)` `(K_(sp)=1.0xx10^(-6))` begins to precipitate from a solution that is 0.30 M `F^(-)` ?

`9.0xx10^(-7)`

`3.3xx10^(-5)`

`1.1xx10^(-5)`

`3.0xx10^(-5)`

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