FeCl3, or iron(III) chloride, is a chemical compound made up of iron and chlorine. It appears as a yellow-brown solid and is highly soluble in water. In its hydrated form, it can absorb moisture from the air, forming a yellow solution. FeCl3 is commonly used in various applications, including water treatment, as a catalyst in chemical reactions, and in the production of pigments. In addition to its industrial uses, FeCl3 plays a role in laboratory settings, particularly in organic synthesis and analytical chemistry. It can also be used in the preparation of other iron compounds. However, it should be handled with care, as it can be corrosive and harmful if ingested or inhaled.