A saturated solution, prepared by dissolving `CaF_2 (s)` in water, has `[Ca^(2+)]=3.3xx10^(-4)M.` What is the `K_(sp)` of `CaF_2`?

Explanation

`CaF_(2(s))hArrCa_((aq))^(2+)+2F_((aq))^(-)`
`[F^-]=2[CA^(2+)]=2xx3.3xx10^(-4)M`
`=6.6xx10^(-4)M`
`K_(sp)=[Ca^(2+)][F^(-)]^2`
`=(3.3xx10^(-4))(6.6xx10^(-4))^2`
`=1.44xx10^(-10)`.