$11.$What compound, if any, will precipitate when $80mL$ of $1\mathrm{.}0{10}^{-5}$MBa$(OH{)}_2$ is added to $20mL$ of $1\mathrm{.}0{10}^{-5}MF{e}_2(S{O}_4{)}_3?$

$12.$

"Hard" water contains alkaline earth cations such as $C{a}^{2+},$ which reacts with $C{O}_{3}2-$ to form $CaC{O}_3.$ Will a precipitate of $CaC{O}_3$ form if a $250mL$ sample of hard water having a $[C{a}^{2+}]=8\mathrm{.}0{10}^{-4}M$ is treated with:

a$.,0\mathrm{.}10mL$ of $2\mathrm{.}0{10}^{-3}MN{a}_{2}C{O}_3$

ANSWER BOTH QUESTIONS WITH ALL WORK