Abstract
The evolution of the oxidation end products of ferrous hydroxide in the acidic sulphated aqueous medium at R = {[FeSO 4]/[NaOH]} initial = 0.5833 has been investigated at various initial concentrations of ferrous ions. The oxidation end products consist of lepidocrocite and goethite at relatively higher initial concentration and mainly of lepidocrocite at lower concentrations. The crystal structure of lepidocrocite is not modified as the initial concentration is decreased, contrary to what has been noticed for goethite in the basic medium.
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