CO₂ = 7.0 6-19. What amount of lime and/or soda ash, in mg/L as CaCO3, is required to soften the Village of Zap's water to 80.0 mg/L hardness as CaCO3? Last modified Jan 25, 2024 learnandcare. Compound Concentration, mg/L as CaCO3 CO₂ 44.2 87.4 Mg2+ 96.3 HCO₂ 204.6 so 73.8

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