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6-16. Determine the lime and soda ash dose, in mg/L as CaCO, to soften the following water to a final hardness of 70.0 mg/L

6-16. Determine the lime and soda ash dose, in mg/L as CaCO3 to soften the following water to a final hardness of 70.0 mg/L a

6-16. Determine the lime and soda ash dose, in mg/L as CaCO, to soften the following water to a final hardness of 70.0 mg/L as CaCO3. The ion con- centrations reported below are all as CaCO3. Ca?+ = 220.0 Mg+ = 75.0 HCO, = 265.0 CO, = 17.0 Answers: Total lime addition = 352 mg/L as CACO3; Add no soda ash

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