Once the iron is in solid form it can be filtered out using a sediment filter. The oxidized form of iron is ferric iron, which precipitates as a yellow, brown or red solid. The idea of aeration to remove iron from water from a borehole or well water is to allow the water to mix with air. If so, the precipitate might be iron phosphate. Does that work if the iron has an oxidation state of 0? much effect on the behavior of iron in waters in the range of pH 5 to 8. Ferrous iron dissolves in water, and it will not precipitate as a solid unless it is oxidized. Fe3+ is insoluble in water, so if you keep it as Fe3+, you should be able to spin it out. When the water’s pH rises above 7.2 to 7.3, the softener’s ability to grab iron from the water becomes increasingly limited. These solid particles containing ferric iron tend to become suspended in water, giving it color. Precipitation reactions can be used for making pigments, removing salts from water in water treatment, and in classical qualitative inorganic analysis.. Precipitation is also useful to isolate the products of a reaction during workup.Ideally, the product of the reaction is insoluble in the reaction solvent. Aeration brings water and air into close contact in order to oxidize the iron and bring it out of solution form to solid-state. Can the iron be retrieved via electroplating? The water becomes aesthetically unacceptable to consumers. INTRODUCTION This report covers a preliminary phase of research by the Geological Survey into the chemistry of iron in natural waters. Organic Bomplexing effects were not studied. It was observed that a blackish precipitate formation was due to the presence of iron and manganese in lake water, which was not completely removed during treatment. 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