Note: optimized site density = 0.25 mol/mol Fe; optimized surface area = 6.49E+03 m2/g.
≡FeOH2+ → ≡FeOH + H+ Ka = 5.13E-08 ≡FeOH → ≡FeO− + H+ Ka = 1.17E-09 Protolysis data taken from [DM90]