Answer to Question #257202 in Inorganic Chemistry for Tahir

Inorganic Chemistry

Question #257202

In some water softening operations, Mg²⁺ must be removed from solution along with Ca²⁺. What pH is required to lower TOT Mg to 10 mg/L as CaC0₃ by precipitation of Mg(OH)₂(s)?
What is the solubility of ferrihydrite (amorphous Fe(OH)₃(s)) in an ideal pH 7.0 solution containing 10^-2 M TOTS0₄? Give your answer in ug/L TOTFe.
A groundwater at pH 7.5 is in equilibrium with P_C02 = 10^-1•5 atm and with siderite (FeC0₃(s)). Determine the total dissolved Fe concentration.

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