Densities and isobaric heat capacities of about 25 aqueous solutions of magnesium perchlorate, Mg(ClO₄)₂(aq), have been measured at concentrations 0.01 ≲ m/mol·kg^–1 ≲ 2.5 using vibrating tube densimetry and flow calorimetry, respectively. Densities were determined at temperatures from 293.15 to 343.15 at 5 K intervals, but heat capacities were restricted to 298.15 K. These data were used to calculate the corresponding apparent molar volumes, V_ϕ, and isobaric heat capacities, C_pϕ, which were extrapolated to infinite dilution using appropriate semi-empirical equations to give the standard-state values, V° and C_p^°. Where comparisons were possible, the present results are in good agreement with literature data but are more extensive and precise. Standard values for Mg²⁺(aq) were obtained using appropriate extrathermodynamic assumptions and also agreed well with literature estimates. Unlike many inorganic salts, the V° values for Mg(ClO₄)₂(aq) do not show a maximum over the investigated temperature range.

中文翻译：

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Mg（ClO ₄）₂水溶液的摩尔体积和热容量

密度和高氯酸镁的约25的水溶液等压热容，镁（CLO ₄）₂（水溶液），已经在浓度0.01≲测量米/摩尔公斤· ^-1使用振动管密度测量≲2.5和分别流量热法，。在温度以5K间隔测定从293.15到343.15的密度，但热容量被限制298.15 K.这些数据被用于计算相应的表观摩尔体积，V _φ，和等压热容量，Ç _{p φ}，其中外推使用适当的半经验方程式进行无限稀释以给出标准状态值V °和C _p ^°。在可能进行比较的情况下，目前的结果与文献数据完全吻合，但范围更广，更精确。Mg ²⁺（aq）的标准值是使用适当的热力学假设获得的，并且与文献估计也很吻合。与许多无机盐不同，Mg（ClO ₄）₂（aq）的V °值在所研究的温度范围内未显示最大值。