Water becomes capable of _______ iron and manganese when the oxygen levels ________.

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Multiple Choice

Water becomes capable of _______ iron and manganese when the oxygen levels ________.

Explanation:
Water is governed by redox chemistry for iron and manganese. When oxygen is abundant, it acts as an oxidant and oxidizes Fe2+ to Fe3+ and Mn2+ to Mn4+. These higher oxidation states form insoluble hydroxides and oxides (like Fe(OH)3 and MnO2) that precipitate out, so dissolved concentrations drop. If oxygen levels fall, reducing conditions prevail, and iron and manganese stay in their reduced, soluble forms (Fe2+ and Mn2+). In this state, they dissolve more readily in water, increasing their dissolved, transportable forms. So water becomes capable of dissolving iron and manganese when oxygen levels decrease. This is why aeration can help remove these metals—it oxidizes them and promotes precipitation for filtration.

Water is governed by redox chemistry for iron and manganese. When oxygen is abundant, it acts as an oxidant and oxidizes Fe2+ to Fe3+ and Mn2+ to Mn4+. These higher oxidation states form insoluble hydroxides and oxides (like Fe(OH)3 and MnO2) that precipitate out, so dissolved concentrations drop. If oxygen levels fall, reducing conditions prevail, and iron and manganese stay in their reduced, soluble forms (Fe2+ and Mn2+). In this state, they dissolve more readily in water, increasing their dissolved, transportable forms. So water becomes capable of dissolving iron and manganese when oxygen levels decrease. This is why aeration can help remove these metals—it oxidizes them and promotes precipitation for filtration.

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