Cerium(III) chloride (CeCl3), also known as cerous chloride or cerium trichloride, is a compound of cerium and chlorine. It is a white hygroscopic solid.
Molar mass： 246.48 g/mol (anhydrous) 372.58 g/mol (heptahydrate)
Appearance： fine white powder
Density： 3.97 g/cm3
Melting point： 817 °C (1,503 °F; 1,090 K) (anhydrous) 90 °C (heptahydrate, decomposes)
Boiling point： 1,727 °C (3,141 °F; 2,000 K)
Solubility in water：100 g/100 ml
Solubility： soluble in alcohol
Magnetic susceptibility (χ)：+2490.0·10−6 cm3/mol
Cerium(III) chloride can be used as a starting point for the preparation of other cerium salts, such as the Lewis acid, cerium(III) trifluoromethanesulfonate, used for Friedel-Crafts acylations. It is also used itself as a Lewis acid, for example as a catalyst in Friedel-Crafts alkylation reactions.