pls explain in depth how you found CO$2,$ soda ash and lime doses. And also how to treat that maximum calcium removal.A water with the characteristics shown in the table below is to be softened:

a$)$ Draw a bar chart of the raw water. $[4$ marks$]$

b$)$ Calculate the chemical requirements $($meq$/$L$)$ required to remove as much of the calcium as

possible using lime$-$soda ash chemical precipitation. Please comment on whether removing

only the calcium hardness is acceptable for this raw water. $[4$ marks$]$

Note that during recarbonation the final alkalinity in the water is converted to $25\%C{O}_3^{2-}$ and

$75\%HC{O}_3.$

c$)$ Draw a bar chart of the finished water. $[4$ marks$]$