Abstract
Stoichiometry of the redox reaction of vanadium(V) by ascorbic acid (H(2)A) has been experimentally determined to be H(2)A+2V(V) -> A+2V(IV)+2H(+). Evidence of induced polymerization of acrylonitrile and the reduction of mercuric chloride indicates that a free-radical mechanism operates during the course of reaction. Vanadium(V) is only reduced to vanadium(IV). The kinetics of this redox reaction have been investigated spectrophotometrically at 35 degrees C in acidic media of H2SO4. In this kinetic study we have observed the nature of vanadium(V)-H(2)A interaction in presence of anionic surfactant of SDS. In V(V)-H(2)A system, the addition of anionic surfactant (SDS) enhanced the reaction rate and shows catalytic effect. This trend was explained by the incorporation/solubilization of vanadium(V) and ascorbic acid in the Stern layer.