Question
1. (Problem 6-13) Determine the lime and soda ash dose, in mg/L as CaCO3, to soften the following water to a final hardness of 80 mg/L as CaCO3. The ion concentrations reported below are all mg/L as CACO;: Са =2 120; Mg 2 30, НСО3: 70, СО2 10.
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