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K(sp) of SrF(2) = 2.8 xx 10^(-9) at 25^(...

`K_(sp)` of `SrF_(2) = 2.8 xx 10^(-9)` at `25^(@)C`. How much `NaF` should be added to `100mL` of solution having `0.016M` in `Sr^(2+)` ions to reduce its concentration to `2.5 xx 10^(-3)M`?

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The correct Answer is:
`0.1178g;`
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