Potentiometric titration of molybdenum(V) with ferric alum

Summary The potentiometric titration of molybdenum(V) with ferric alum has now been investigated. The results show that the potentiometric titration of molybdenum(V) is possible at 98–100 C in a carbon dioxide or other inert gas atmosphere in a medium which is 0.5 to 1.0 N in hydrochloric acid. At higher concentrations of hydrochloric acid, there is no steep jump in potential at the end point. In titrations carried out in 0.5 N hydrochloric acid, the potential jump is about 50 mv per 0.1 ml of 0.05 M ferric alum; when the hydrochloric acid concentration is increased to 1.0 N, the potential jump is about 30 mv per 0.1 ml of 0.05 molar ferric alum solution; in titrations with decinormal solutions of the reactants in 0.5 N hydrochloric acid, the potential jump at end point is about 90 mv per 0.1 ml of iron (III) solutionOne of us, Dr. M. Suryanarayana, desires to thank the Ministry of Education Govt. of India for the award of research scholarship.