Environment & Ecology · Environmental Engineering
From the water analysis data given below, calculate the amount of lime and soda required (in mg/L as CaCO3) to soften the water to 90.0 mg/L as CaCO3: Composition of water (mg/L as CaCO3): Ca2+ = 159.2 Mg2+ = 75.8 Na+ = 27.4 CO2 = 29.3 HCO3- = 195.0 SO42- = 39.8 Cl- = 27.6
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1~ 235 and ~ 60
- 2~ 296 and no soda ash✓
- 3~ 262 and ~ 34
- 4~ 235 and no soda ash
Correct answer
~ 296 and no soda ash
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