Iron(III) chloride is a chemical compound with the formula FeCl3. It consists of iron in the +3 oxidation state and chloride ions. This compound appears as a yellow-brown solid and is highly soluble in water, forming a yellow solution. It is commonly used in water treatment, as a coagulant to remove impurities. In addition to its use in water purification, iron(III) chloride is also employed in various industrial processes, including the production of pigments and as a catalyst in chemical reactions. It can be produced by reacting iron with chlorine gas or by dissolving iron(III) oxide in hydrochloric acid.