Barium Orthoarsenite, Ba₃(AsO₃)₂

Barium Orthoarsenite, Ba₃(AsO₃)₂, is obtained as a white amorphous powder by precipitating barium chloride solution with potassium orthoarsenite and drying at 100° C. in a current of hydrogen. Addition of barium hydroxide solution does not give a pure compound. An acid salt, BaH₄(AsO₃)₂, has also been described.