${?}^a$ Not in $m\frac{g}{L}.$

a$)$ If the water is treated with $30m\frac{g}{L}$ of ferric chloride $(FeC{l}_3)$ for turbidity coagulation,

how much alkalinity will remain? Ignore the side reactions with phosphorus and

assume all the alkalinity is $HC{O}_3.$

b$)$ Rework problem $3-$a$,$ but instead, estimate how much alkalinity would remain if $30$

$m\frac{g}{L}$ of alum $(A{l}_2(S{O}_4{)}_3*14H_{2}O)$ were used instead of ferric chloride.

c$)$ Baton Rouge has a population of $227,715$ people. Estimate the daily emissions of $C{O}_2$

$(kg)$ associated with treatment of the water from problem $3$ when $($ i $)$ alum is used as a

coagulant, and $($ii$)$ ferric chloride is used as a coagulant. $($iii$)$ Recommend a coagulant

if the city is interested in minimizing global warming potential associated with $C{O}_2$

production. For the manufacture of alum and ferric chloride, assume $0\mathrm{.}5kgCO{K}_{2}eq/$

kg alum produced, $0\mathrm{.}18kgC{O}_{2}e\frac{q}{k}g$ ferric chloride produced. Assume the average

demand for water in Baton Rouge is $440$ Lpod.

ferric chloride, $\{$:$FeC{l}_3+?HC{O}_3^{-}+?H_{2}OFe(OH{)}_3*3H_{2}O(s)+?C{O}_2+?C{l}^{-})$

I can't figure out c$.$ Please Help