Aqueous Ni II -nitrato complexes

The experimental data reported in [73FED/SHM] were re-evaluated taking into account only formation of the NiNOj species (see Appendix A). To minimise the medium effect, only half of the experimental data, for which [ NO ] [ CIO4 ], were taken into account. The recalculated constants are also listed in Table V-27. 

Only a single value is reported for the enthalpy of Reaction (V.96) [75ARU]. Recalculating the experimental data using the tentative values of log,Q ((V.96), 

15 K) = (6.0 4.0) kJ-mol can be estimated for / = 1 M (Ni(C104)2), from the data reported in [75ARU] (see Appendix A). The selected value yields, using NEA-TDB auxiliary data  

Due to the low and rather uncertain value of log, yff ((V.96), 298.15 K), the description of the Ni(II)-nitrate system in terms of ion-ion interactions may be in many cases more straightforward. Therefore, the ion interaction coefficient e(Ni, NOp is also derived in this review from the osmotic and mean activity coefficients of Ni(N03)2 solutions, using Equations (V.74) and (V.75). 

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