as Cao and Na2CO3, to sof 130 mg/L as CACO3. The ic Assume the lime is 90% pu
as Cao and Na2CO3, to sof 130 mg/L as CACO3. The ic Assume the lime is 90% pu
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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4-20

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4.20. Determine the lime and soda ash dose, in mg/L as CaO and Na2CO3, to soften the following water to a final hardness of less than 130 mg/L as CaCO3. The ion concentrations reported below are all mg/L as CaCO3. Assume the lime is 90% pure and the soda ash is 97% pure.
- Ca²⁺ = 210.0
- Mg²⁺ = 23.0
- HCO₃⁻ = 165.0
- CO₂ = 5.0
4.22. Determine the lime and soda ash dose, in mg/L as CaCO3, to soften the following water to a final hardness of less than 120.0 mg/L as CaCO3. If the price of lime, purchased as CaO, is $61.70 per megagram (Mg), and the price…
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