Problem $4$:

$(02)$

Calculate the weight percentage of chlorine in Hypochlorite $($ NaOCl $).$ What mass of NaOCl should be provided if NaOCl is selected to supply the required chlorine dose?

Problem $5$:

Estimate the amount of alkalinity $($in $m\frac{g}{L})$ consumed from the addition of $100$

$(02)$

$m\frac{g}{L}$ of alum $.$ Commercial alum has an average molecular weight of $594.$ Hint: When alum is added to a water containing alkalinity, the following reaction occurs:

$A{l}_2(S{O}_4{)}_3*14H_{2}O+6HC{O}_3^{-}2Al(OH{)}_3*3H_{2}O(s)+6C{O}_2+8H_{2}O+3S{O}_4^{2-}$