Calorimetric studies for the dissolution of orthoperiodate salt of the type: M2HIO6·nH2O (M = Cu2+, Zn2+, Cd2+)

The standard molar dissolution enthalpies of metallic orthoperiodates hydrates salts of the type, M2HIO6·nH2O (M=Cu2+, Zn2+, Cd2+; n=2, 1.25, 1.25), in aqueous 3 mol dm−3 HNO3 have been measured by using an isoperibolic calorimeter at 298.2 K. The thermodynamic parameters of these compounds, e.g. ΔdissG°m and ΔdissS°m, have been calculated or estimated. The related values published in the literature and that were obtained from solubility determinations using a spectrophotometer in the 298.5–328 K temperature range have been also revised by using a linear regression analysis.