Titanyl Tetrarsenite, (TiO)₅As₄O₁₁

Titanyl Tetrarsenite, (TiO)₅As₄O₁₁, is obtained by the action of potassium tetrarsenite in excess on an almost neutral solution of titanyl sulphate. The gelatinous precipitate first formed gradually crystallises. The arsenite dissolves in acids without decomposition, but is insoluble in aqueous potassium hydroxide or ammonia. It decomposes when heated.