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Calculate F^- in a solution saturated wi...

Calculate `F^-` in a solution saturated with respect of both `MgF_2 and SrF_2. K_(sp) (MgF_(2)0=9.5 xx 10^(-9), K_(sp) (SrF_(2))=4 xx 10^(-9)`.

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The correct Answer is:
`[F^(-)]=3 xx 10^(-5)M`
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