A water with a pH =7.0 has been analyzed and found to have the following composition,...

A water with a pH =7.0 has been analyzed and found to have the following composition, with all concentration in mg/L as CaCO3:
CO2 = 125 mg/L
Ca2+ = 250 mg/L
Mg2+ = 80 mg/L
Fe2+ = 10 mg/L
Alkalinity = 260 mg/L
SO4 2- = 50 mg/L
Cl- = 30 mg/L
a) what is the hardness of this water? Report in mg/L as CaCO3
b) use the excess Lime soda Ash method and estimate the kilograms of lime and kilograms of soda Ash that will be needed per 1MGD to soften this water. Report assumptions used in the calculations.

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Ally Wells answered 2 months ago

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