Solubility Of NH4VO3 In NH4H2PO4-H2O And ... - Ingenta Connect

Skip to main content Home / Acta Physico-Chimica Sinica, Volume 32, Number 5 Solubility of NH4VO3 in NH4H2PO4-H2O and (NH4)3PO4-H2O Systems

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Authors: GONG, Xu-Li 1 ; ZHANG, Chang-Qiao 1 ; NING, Peng-Ge 2 ; CAO, Hong-Bin 2 ; ZHANG, Yi 2 ;

Source: Acta Physico-Chimica Sinica, Volume 32, Number 5, 15 May 2016, pp. 1134-1142(9)

Publisher: Editorial Office of Acta Physico-Chimica Sinica

DOI: https://doi.org/10.3866/PKU.WHXB201602194

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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. No References for this article. No Supplementary Data. No Article Media No Metrics

Keywords: (NH4)3PO4 solution; NH4H2PO4 solution; NH4VO3; Solubility

Document Type: Research Article

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

Publication date: 15 May 2016

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• Acta Physico-Chimica Sinica, founded in 1985, is sponsored by the Chinese Chemical Society and organized by the College of Chemistry and Molecular Engineering, PekingUniversity. Since 1997, Acta Physico-Chimica Sinica has been indexed in SCI of ISI (US). Acta Physico-Chimica Sinica is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and material physical chemists. Manuscripts that are essentially reporting data, applications of data, or reviews of the literature are not suitable for publication in Acta Physico-Chimica Sinica.
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