Europium(III) arsenate is an arsenate salt of europium, with the chemical formula of EuAsO4. It has good thermal stability, with its pKsp,c of 22.53±0.03. It is a colorless crystal with a xenotime structure.
Preparation Europium(III) arsenate can be prepared by reacting sodium arsenate (Na3AsO4) in a europium(III) chloride (EuCl3) solution:Gabisoniya, Ts. D.; Nanobashvili, E. M.. Synthesis of rare earth metal arsenates. Soobshcheniya Akademii Nauk Gruzinskoi SSR (1980), 97(2), 345-8. Na3AsO4 + EuCl3 → 3 NaCl + EuAsO4↓
Reacting europium(III) oxide (Eu2O3) with arsenic pentoxide (As2O5) can also obtain europium(III) arsenate. Eu2O3 + As2O5 → 2EuAsO4
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