$100mL$ of $1\mathrm{.}00$MNaF is mixed with $100mL$ of $1\mathrm{.}00MSr(N{O}_3{)}_2.$ For $Sr{F}_2,K_{SP}=2\mathrm{.}0{10}^{-10}.$

What is the equilibrium concentration of $S{r}^{2+}?$

First, use the precipitation reaction to find the maximum amount of precipitate:

$S{r}^{2+}(aq)+2F^{-}(aq)Sr{F}_2(s)$

Then, use the dissolution reaction to find the maximum amount of solute re$-$dissolved:

$Sr{F}_2(s)S{r}^{2+}(aq)+2F^{-}(aq)$

$0\mathrm{.}10M$

$0\mathrm{.}05M$

$0\mathrm{.}25M$

Question $2(1$ point$)$

What is the equilibrium concentration of $F^{-}?$

$1\mathrm{.}80{10}^{-5}M$

$1\mathrm{.}13{10}^{-5}M$

$2\mathrm{.}83{10}^{-5}M$