NH4VO3在NH4H2PO4-H2O和(NH4)3PO4-H2O体系中的溶解度

doi:10.3866/PKU.WHXB201602194

Abstract

Abstract:

The solubility of ammonium metavanadate (NH₄VO₃) in NH₄H₂PO₄-H₂O and (NH₄)₃PO₄-H₂O systems at T = 298.15-328.15 K was measured using the classic isothermal dissolution method. The densities and pH values of the solutions were also determined. The solubility of NH₄VO₃ decreased at first and then increased with increasing NH₄H₂PO₄ or (NH₄)₃PO₄ concentrations. This was considered to be caused by the common ionic effect, chemical reaction equilibrium and ionic activity. At T = 298.15 K, the solubility of NH₄VO₃ in the NH₄H₂PO₄-H₂O system was the highest, and was lower in the (NH₄)₃PO₄-H₂O system. The solubility in the (NH₄)₂HPO₄-H₂O system was the lowest. The mean ionic activity coefficients were calculated for the three phosphate solutions at C = 0.5 mol·kg^-1 using the pH values and dissolution reaction constant. The mean ionic activity coefficients were the largest for the (NH₄)₂HPO₄-H₂O system, and were smaller for the (NH₄)₃PO₄-H₂O system. The mean ionic activity coefficients were the smallest for the NH₄H₂PO₄-H₂O system, which agrees with the solubility variations of NH₄VO₃ in the three phosphate systems.

Key words: NH₄VO₃, Solubility, NH₄H₂PO₄ solution, (NH₄)₃PO₄ solution

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Xu-Li GONG,Chang-Qiao ZHANG,Peng-Ge NING,Hong-Bin CAO,Yi ZHANG. Solubility of NH₄VO₃ in NH₄H₂PO₄-H₂O and (NH₄)₃PO₄-H₂O Systems[J]. Acta Phys. -Chim. Sin. 2016, 32(5), 1134-1142. doi: 10.3866/PKU.WHXB201602194

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Solubility of NH₄VO₃ in NH₄H₂PO₄-H₂O and (NH₄)₃PO₄-H₂O Systems

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Solubility of NH₄VO₃ in NH₄H₂PO₄-H₂O and (NH₄)₃PO₄-H₂O Systems