1 Aqueous ironII ions can be represented as FeH0ag to explic

1. Aqueous iron(II) ions can be represented as Fe(H0)](ag) to explicitly emphasize the six particular water molecules in close contact with the ion. From this perspective, the formation of the thiocyanatoiron(III) iron can be understood as thiocyanate replacing one of these six water molecules. [Fe(H2O)6]3t(aq) + SCN-(aq) [Fe(H2O),SCNI2+(aq) + H20() Based on the observed temperature dependence of the equilibrium constant and what that implies about AH, what can be inferred about the relative strength of the Fe3-H20 interaction and the Fe3-SCN interaction?

Solution

1. For the given reaction,

the forward reaction is exothermic in nature, that is decreasing the temerature would favour the forward reaction and formation of products.

this implies that the relative bond strength of Fe3+-H2O is weaker than the Fe3+-SCN- interaction and thus forward reaction is favoured at lower temperature. That is low energy requirement, thermodynamically more favorable reaction.