Aluminium Arsenite, AlNaO₃

Aluminium Arsenite, AlNaO₃, has been obtained by the addition of barium arsenite or potassium tetrarsenite, K₂As₄O₇.2H₂O, to an aqueous solution of aluminium sulphate. In the former case, after filtration and concentration over sulphuric acid, rhombic pyramids were obtained. The second method yielded a gelatinous precipitate which after drying left a white powder. The arsenite decomposes on heating, alumina and arsenious oxide being the sole products; it is slightly soluble in boiling water, readily soluble in acids and in aqueous sodium hydroxide.