Abstract
The reaction, between V 2O 5 and molten KNO 3 is studied potentiometrically by conducting acid-base titration experiments in situ. An oxygen Electrode is used as indicator Electrode. The titration curves show three distinct potential drops. The first step is due to the transformation, of V 2O 5 into metavanadate which reacts instantly with the nitrate base-electrolyte to yield pyrovanadate and a nitrate complex of the probable formula [VO 3-O-NO 2] 2−. Both compounds change upon neutralization into orthovanadate along the second and third steps, respectively, of the titration curves. The effect of varying the temperature, fusion time, concentration of V 2O 5 and the effect of the addition of increasing quantities of NaVO 3 and Na 4V 2O 7 on the titration curves of V 2O 5—KNO 3 melts is investigated in detail. A mechanism accounting for the disappearance of the pentoxide is proposed. The reaction between V 2O 5 and molten KNO 3 is zero-order with respect to V 2O 5.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
