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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.
if you add sodium hydroxide solution to a solution of an iron ii compound you get a green precipitate of iron ii hydroxide this is quite quickly oxidised by oxygen in the air to an orange brown precipitate of iron iii hydroxidethe half equation for the iron ii hydroxide is straightforwardstart with what you know you obviously need another hydroxide ion on the left hand side this is even more straightforward than the previous example to balance the charges add an electron to the right hand sidehe half equation for the iron ii hydroxide is straightforward start with what you know you obviously need another hydroxide ion on the left hand side this is even more straightforward than the previous example to balance the charges add an electron to the right hand side