水合正高碘酸镍盐溶解反应的热力学性质

Thermodynamic properties for the dissolution of nickelorthoperiodate(Ⅶ) hydrate

用具有恒温环境的反应热量计测定了Ni2HIO6·3H2O在3mol·dm-3HNO3水溶液中的标准摩尔溶解焓变,计算出了相应的标准摩尔自由能变与标准摩尔熵变,用线性回归法分析并修正了用分光光度法在298.5～328K范围内测定与计算的文献值.

Using an isoperibol calorimeter,this paper measured the standard molar dissolution enthalpy of nickel orthoperiodate(Ⅶ) hydrate in aqueous 3 mol·dm^(-3) HNO_3 at 298.2 K. From the result and other auxiliary quantities,this paper computed the standard molar Gibbs free energy change and entropy change of the compound.Furthermore,through a linear regression analysis,it corrected the literature values obtained from the solubility determination using a spectrophotometer over the temperature range 298.5~328 K.