Solubility Investigations in the Na₂SO₄ + V₂O₅ + H₂O System from 293 K to 323 K

Abstract

Mutual solubility of Na2SO4 and V2O5 in water at the temperature range (293 to 323) K was investigated by the method of isothermal saturation. The vanadate ion concentration was determined by a spectrophotometric analysis using 4-(2-pyridylazo)resorcinol, concentration of sulfate ions by a gravimetric method as BaSO4, and the sodium ion concentration was determined by an atomic absorption spectrometry method. On the basis of the results, the section of the solubility polytherm for the Na2SO4 + V2O5 + H2O system was plotted. These data can be used to assess the possibility to utilize vanadium(V) oxide from the vanadate catalyst used in the process of SO2 to SO3 oxidation for the synthesis of Na2CO3 or K2CO3.

The Influence of Intercalated Ions on Cyclic Stability of V2o5/Graphite Composite in Aqueous Electrolytic Solutions: Experimental and Theoretical Approach

“…Dissolved V(IV)-oxide may be oxidized to V(V) one in aerated aqueous solutions and contribute to the yellow color. Due to a slow dissolution and very limited concentration of vanadium pentoxide in neutral aqueous solutions of strong electrolytes, (of the order 10 À4 M [40]) the current accompanied to redox processes of soluble species are inreadable on the scale used to show the intercalation voltammograms in Fig. 3.…”

Solubility in the reciprocal quaternary K+-Na+-SO42−-VO3−-H2O system at (293.15 and 313.15)K

“…(2) and (3) respectively. The solutions represented by triple points P 1 -P 4 are saturated with three salts: [18][19][20].…”

Product of dissolution of V2O5 in the choline chloride–urea deep eutectic solvent

“…Thus the solubility of V 2 O 5 in ChCl-urea solvent is more than twelve times higher as that in pure water, which is exactly 374 ppm [6].…”