Cerium(III) hydroxide is a

hydroxide Hydroxide is a diatomic anion with chemical formula OH−. It consists of an oxygen and hydrogen atom held together by a single covalent bond, and carries a negative electric charge. It is an important but usually minor constituent of water. I ...

of the

rare-earth metal The rare-earth elements (REE), also called the rare-earth metals or (in context) rare-earth oxides or sometimes the lanthanides (yttrium and scandium are usually included as rare earths), are a set of 17 nearly-indistinguishable lustrous silve ...

cerium. It is a pale white powder with the chemical formula Ce(OH)₃.PubChem

Preparation

Cerium(III) hydroxide is prepared by the reaction of hot water at 90 °C on cerium metal: : + 6H2O -> atop2Ce(OH)3(v) + 3H2

References

{{Hydroxides Hydroxides Cerium(III) compounds