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Cerium compounds may be recognized by the red precipitate of ceric hydroxide, which is formed when sodium hypochlorite is added to a colourless cerous salt.

Compounds of cerium with volatile acids yield dioxide on ignition; and this, on solution in hydrochloric acid, yields cerous chloride and chlorine.

A hydrated chloride of composition 2CeCl3�15H2O is also known, and is obtained when a solution of cerous oxide in hydrochloric acid is evaporated over sulphuric acid.

Double salts of cerous chloride with stannic chloride, mercuric chloride, and platinic chloride are also known.

By the addition of caustic soda to cerous salts, a white precipitate of cerous hydroxide is formed.