Strontium cupriferrocyanide, SrCuFe(CN)6, is obtained in a similar manner to the calcium salt, which it closely resembles.
When a copper sulphate solution is added to excess potassium ferrocyanide, a mixture of di-potassium cupric and di-potassium tricupric ferrocyanides is produced, namely K2CuFe(CN)6 and K2Cu3[Fe(CN)6]2 respectively.
If cuprous chloride is substituted for cupric sulphate, then different cuprous potassium ferrocyanides are obtained according to circumstances, namely K2Cu•2[Fe(CN)6]; KCu•Cu••3[Fe(CN)6]2; and KCu•3[Fe(CN)6]. The last of these is obtained, when cuprous chloride is in great excess, as a white precipitate. |