2. At a wastewater-treatment plant FeCl3(s) is added to remove excess phosphate from the effluent. Assume that the reactions that occur are FeCl3(s) 5 Fe+ + 3C1 FePO4(s) 5 Fe3+ + PO3- The equilibrium constant for the second reaction is 10-26.4. What concentration of Felt would be needed to maintain the phosphate concentration below the limit of 1 mg/L of P? (Hint: Assume all the P is in the PO form so we’re asking for 1 mg/L PO, as P.) Answer: 6.88×10-8 mg/L
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