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首页> 外文期刊>Journal of Chemical and Engineering Data: the ACS Journal for Data >Ion Association in Dilute Aqueous Magnesium Sulfate and Nickel Sulfate Solutions Under Hydrothermal Conditions by Flow Conductivity Measurements
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Ion Association in Dilute Aqueous Magnesium Sulfate and Nickel Sulfate Solutions Under Hydrothermal Conditions by Flow Conductivity Measurements

机译：水热条件下流动电导率法测定稀硫酸镁和硫酸镍水溶液中的离子缔合

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摘要

Electrical conductivities of very dilute aqueous solutions of magnesium sulfate and nickel sulfate (～ 10~(-3) mol·kg~(-1)) were measured at temperatures from (398.15 to 548.15) K and from (398.15 to 498.15) K, respectively, with an alternating current (AC) conductivity flow cell at a pressure of 18.62 MPa. The resulting conductivity data were modeled using the Fuoss-Hsia- Fernandez-Prini (FHFP) conductance equations together with the appropriate activity coefficient expressions, to obtain equilibrium constants for the ion association reactions: Mg~(2+)(aq) + SO4~(2-)(aq) <->SO4°(aq) and Ni~(2+)(aq) + O4~(2-)(aq) <-> NiSO4°(aq). The equilibrium constants K_A for the two systems, which correspond to the formation of all types of ion pairs (solvent-solvent-separated, solvent-separated, and contact ion pairs), agree remarkably well with results calculated from solubility measurements at much higher concentrations. The results were described by the temperature-dependent equilibrium constant model to a precision of ± 0.03 in log K_A.
机译：在（398.15至548.15）K和（398.15至498.15）K的温度下测量了非常稀的硫酸镁和硫酸镍水溶液（〜10〜（-3）mol·kg〜（-1））的电导率，分别使用压力为18.62 MPa的交流电（AC）电导流动池。使用Fuoss-Hsia-Fernandez-Prini（FHFP）电导方程和适当的活度系数表达式对所得的电导率数据进行建模，以获得离子缔合反应的平衡常数：Mg〜（2 +）（aq）+ SO4〜 （2-）（水溶液）-SO 4°（水溶液）和Ni 2（2 +）（水溶液）+ O 4-（2-）（水溶液）-NiSO 4°（水溶液）。这两个系统的平衡常数K_A对应于所有类型的离子对（溶剂-溶剂分离，溶剂分离和接触离子对）的形成，与在更高浓度下进行溶解度测量所得出的结果非常吻合。结果由温度相关的平衡常数模型描述，对数K_A的精度为±0.03。

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