Cobalticyanide ion

Compare the stability of the free cobaltic ion, Co+ + +, with that of the cobalticyanide ion, Co(CN). ---------, and explain in terms of electronic struc-... 

Some of these complexes are very stable —the stability of the argento-cyanide ion, Ag(CN)2, for example, is so great that addition of iodide ion does not cause silver iodide to precipitate, even though the solubility product of silver iodide is very small. The ferrocyanide ion, Fe(CN)e, ferricyanide ion, Fe(CN)e, and cobalticyanide ion, Co(CN)e—, are so stable that they are not appreciably decomposed by strong acid. The others are decomposed by strong acid, with the formation of hydrocyanic acid, HCN. 

Within the category of ionic crystals, there are two similar complex ions of cobalt (III) which have been extensively studied cobaltic trisethylenediamine nitrate (9 ) and potassium cobalticyanide (6S). Both these crystals show fairly low inherent retentions (approximately 5% and 19%, respectively) and both give evidence of fragments having... 

Denoting the charge on the ions by =3 and the degree of dissociation of lanthanum cobalticyanide by a, and noting that the ionic strength I is equal to zac, we obtain... 

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