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Potassium ferricyanide dissociates into Potassium ions and ferricyanide ions.

K₃ [ Fe (CN)₆ ]    ====>     3 K⁺  +   Fe (CN)₆³⁻ 

one mole gives rise to 4 moles of ions.   there is some thinking that Ferricyanide ions dissociate into iron and  cyanide ions... But  they stay together as one ion. 

1 5 1