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9.4(10+0)

The previous optimum values of pH apply only at 25°C. As indicated in the formulas, equilibrium constants are being used to compute these values. The values of the equilibrium constants vary with temperature, so the optimum range at other temperatures would be different. Equilibrium constants at other temperatures can be calculated using the Van't Hoff equation which, however, requires the values of the standard enthalpy changes. At present, these values are unavailable making values of optimum pH range at other temperatures impossible to calculate. For this reason, the pH range found above must be modified to a conservative range. Hence, adopt the following: for ferrous removal as Fe(OH)2, 11.5 < optimum pH < 12.5 and for ferrous removal as Fe(OH)3, 5.5 < optimum pH < 12.5.

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