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Iron(III) chloride is a yellow solid. It dissolves in water to make a colloid of iron(III) oxide, making the water look muddy. When it is dissolved in an acidic solution, it is bright yellow. When it is very concentrated in a solution, it is dark brown. It is corrosive to skin and metals. It reacts with iron to produce iron(II) chloride. It fumes hydrochloric acid in moist air. It is a weak oxidizing agent. It reacts with copper(I) chloride to make copper(II) chloride. It breaks down when heated to make chlorine and iron(II) chloride. Preparation. It can be made by mixing hydrochloric acid and iron(III) oxide. It can be made by mixing iron and chlorine. It can also be made by reacting iron(II) chloride with chlorine at a low temperature. Uses. It is used in sewage processing. It reacts with slightly basic water to make a floc that can remove things from the water.
Once settled, the top layer of the solution will be ferrous chloride and water (a transparent green color), whereas the bottom will be the remaining iron (the black). Ferric Chloride is FeCl3 and Ferrous Chloride is FeCl2. Ferric Chloride contains Iron+3 and Ferrous Chloride contains Iron+2. Ferric Chloride may react with pure Iron and create ferrous chloride. Commonly found in PCB etchant, Ferric Chloride solution will change from a dark brown when mixed with iron (steel wool) and distilled water and become black.