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The magnitude of the enthalpy values for the successive reactions of ethylenediamine with aqueous CUSO4 are...

The magnitude of the enthalpy values for the successive reactions of ethylenediamine with aqueous CUSO4 are larger than than the corresponding values with NiSO4. Suggest two possible explanations for this

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Ethylenediamine, H2NCH2CH2NH2, is a bidentate ligand, since it can attach to a metal center with its two nitrogen atoms. Such a ligand is also called a chelating ligand. Thus, ethylenediamine (en) displaces H2O molecules in Ni(H2O)6 2+ two at a time, in three steps. Each replacement occurs with evolution of heat. When aqueous Ni(H2O)6 2+ and Cu(H2O)6 2+ complexes react successively with several increments of ethylenediamine, each replacement of two water molecules with the en occurs with evolution of heat. By measuring the evolved heat, it is possible to determine the maximum number of ethylenediamine molecules that have chelated in each complex ion.

Therefore, one of my suggestion is because of the differences between Cu-H2O with Ni-H2O bond, the heat evolved is larger when Cu is involved because their electronegativity.

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