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A groundwater contains magnesium at a concentration of 98.0 mg/L as CaCO3. The magnesium is to...

A groundwater contains magnesium at a concentration of 98.0 mg/L as CaCO3. The magnesium is to be removed by precipitation as Mg(OH)2. What must the pH be in order to attain a final magnesium concentration of 5.0 mg/L as CaCO3? Note: Mg(OH)2 = Mg2+ + 2OH-, pKs = 11.25.

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