| 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. |