Iron(III) chloride, also known as ferric chloride, is a chemical compound with the formula FeCl3. It appears as a yellow-brown solid and is highly soluble in water, forming a dark brown solution. This compound is commonly used in water treatment processes, where it helps remove impurities and clarify drinking water. In addition to its use in water purification, Iron(III) chloride is utilized in various industrial applications, including the production of pigments and as a catalyst in chemical reactions. It is also employed in the etching of metals and in the manufacture of printed circuit boards.