Strontium ferrocyanide, Sr₂Fe(CN)₆

Strontium ferrocyanide, Sr₂Fe(CN)₆.14H₂O, is obtained as a soluble salt by neutralising hydrogen ferrocyanide with the hydroxide or carbonate of strontium. The salt crystallises in monoclinic prisms containing 14 molecules of water, of which seven are lost on exposure to air and a further six when kept over concentrated sulphuric acid.

A study of the osmotic pressures and electric conductivities of solutions of strontium ferrocyanide in water leads to the conclusion that the negative radicles are associated to double ions, namely [Fe(CN)₆]₂''''''''.