Barium ferricyanide, Ba₃[Fe(CN)₆]₂

Barium ferricyanide, Ba₃[Fe(CN)₆]₂.20H₂O, is prepared by neutralising ferricyanic acid with barium carbonate and evaporating to crystallisation in vacuo. It also results on boiling a solution of barium ferrocyanide with lead dioxide. It yields reddish brown crystals. These are soluble in water without decomposition. The salt is decomposed on warming with acids. The compound Ba₃[Fe(CN)₆]₂.2BaBr₂.20H₂O, has been obtained.