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During the reaction of Fe(II) with oxygen, three regions of nearly constant pH are observed, each separated by two regions where there is an abrupt pH change. Data for the oxidation of a suspension with [Fe(II)]/[OH - ] = 7 and 0.22 M Fe(II) indicate that the oxidation to Fe(III) and the associated hydrolysis to produce a proton are rapid compared to the reaction that consumes the proton...
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