Ferric chloride FeCl₃ chemical formula, molecular weight 162.61. Also known as ferric chloride. The six-party black, brown crystal density 2.898g/cm³. The air suction deliquescence easy, soluble in water, hydrolysis was tan, significantly acidic. Talk with water to form 2 ~ six water molecules hydrates, FeCl₃ 6H₂O is orange crystals. There oxidation. For chlorination reagents, oxidants, hemostatic agents, catalysts, lithographic printing, and the preparation of dyes, such as ferric salt. With iron oxide hydrochloride or chlorine with ferrous chloride in the reaction.