电导率法对偏钒酸铵在草酸溶液中的溶解研究

利用电导率法,对偏钒酸铵在草酸溶液中的反应溶解进行测量分析,找出偏钒酸铵在草酸中的反应及反应溶解度的变化情况。实验得出偏钒酸铵在草酸中钒的价态发生V5+→VO2+(黄色)→V3+(绿色)→VO2+(蓝色)的反应溶解性的变化,其原因是由于偏钒酸铵和草酸生成络合物(NH4)2(VO)2(C2O4)3],降低了溶液中起电荷传递作用的离子浓度,而且络合离子的存在会阻碍导电粒子的定向移动,因此,电导率随浓度的增加而降低。

Solubility of ammonium metavanadate in the oxalate solution by conductivity

The solubility of the oxalate solution was measured and analyzed by electrical conductivity and the reaction principle was explored.The result showed that vanadium changed in the valence V5+→VO+2(yellow) →V3+(green)→VO2+(blue).A reaction between ammonium metavanadate and oxalic acid to form compound(NH4)2(VO)2(C2O4)3],so that this solution will not only reduce the ion concentration with the role of charge transfer but also hinder the directional movement of conducting particles in the existence of complex ion.Therefore,electrical conductivity decreases with the concentration increasing.