Reactions
Erbium metal tarnishes slowly in air. Erbium burns readily to form erbium (III) oxide:
Formation of erbium oxide: 4 Er + 3 O2 → 2 Er2O3 Erbium oxide is insoluble in water and soluble in mineral acids. Er2O3 readily absorb moisture and carbon dioxide from the atmosphere. It can react with acids to form the corresponding erbium(III) salts.
Reaction with hydrochloric acid: Er2O3 + 6 HCl → 2 ErCl3 + 3 H2O
Read more about this topic: Erbium(III) Oxide
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