H

4 , I 2KFeOHcTH

7FeOH cK w

K Fe(OH)4cKw TFe(OH)4cTH

The value of [Hopt] may be solved by trial error.

Example 12.2 A raw water containing 140 mg/L of dissolved solids is subjected to coagulation treatment using copperas. Calculate the optimum pH that the operation should be conducted. Assume the temperature of operation is 25°C.

Solution:

7FeIIK w

7FeOHcKw

FeOHc7H | rxJ+ T2

KFe(OH)3cKw 7Fe(OH)3c7H

2Ksp,Fe(OH)27H 7FeIIK2w

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