Y

1O-11

4.O5(1O-18)

1O-12

1O-12-1O-11 3.99(10-2Q)-4.05(10-18) y = 1.11(1O-12)

Example 12.3 A raw water containing 140 mg/L of dissolved solids is subjected to coagulation treatment using a ferric salt. Calculate the optimum pH that the operation should be conducted. Assume the temperature of operation is 25°C.

Solution:

8^Fe2(0H)2c7lJ 1+ ]5 + J ^p^O^/li 1+ ]4 + J2 KFe0H c7H i[XJ+ ]3

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