Determination of Volume Properties of Aqueous Vanadyl Sulfate at 283.15 to 323.15 K

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• 作者：Wei-Guo Xu ; Ye Qin ; Fei Gao ; Jian-Guo Liu ; Chuan-Wei Yan ; Jia-Zhen Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 30, 2014
• 年：2014
• 卷：53
• 期：17
• 页码：7217-7223
• 全文大小：338K
• 年卷期：v.53,no.17(April 30, 2014)
• ISSN：1520-5045

文摘

This paper reports the densities of aqueous VOSO₄ that were measured by an Anton Paar DMA 4500 M from 0.0500 mol路kg^鈥? to 3.000 mol路kg^鈥? at 283.15 to 323.15 K. The apparent molar volume, V_B, the partial molar volume of VOSO₄, V̅_B, the apparent molar expansibility of the solute, _E, and coefficient of thermal expansion of the solution, 伪, were calculated. First, these properties described above have been discussed with the temperature and concentration variation. Then the values of the apparent molar volume, V_B, were fitted to Pitzer鈥檚 model for volumetric properties by the method of the least squares, which allowed the partial molar volume of the VOSO₄ at infinite dilution, V̅_B⁰, and Pitzer鈥檚 parameters, 尾_MX^(0)V, 尾_MX^(1)V, and C_MX^V, to be obtained. The small standard deviations of the fitting show that Pitzer鈥檚 model is also appropriate for representing the volumetric properties of aqueous solutions of VOSO₄. Using the data from literature, the partial molar volume of the ion VO²⁺ at infinite dilution, V̅_C⁰, was discussed and the result showed that the negative value of V̅_C⁰ can be attributed to strong hydration of VO²⁺ as other divalent ions.