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

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

1.
1 School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, P. R. China;
2.
2 Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China

Corresponding author: ZHANG Chang-Qiao, NING Peng-Ge,
Received Date: 26 November 2015
Available Online: 17 February 2016
Fund Project: 国家科技支撑计划(2015BAB02B05) (2015BAB02B05)国家重点基础研究发展规划项目(973)(2013CB632605) (973)(2013CB632605)国家自然科学基金项目(51425405)资助 (51425405)

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.
- NH₄VO₃,
- Solubility,
- NH₄H₂PO₄ solution,
- (NH₄)₃PO₄ solution
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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