Automatic and coulometric titrations in studies of chemical kinetics. III. Evaluation of the rate constant for the disproportionation of uranium(V) by automatic amperometric titrations of uranium(VI) with chromium(II)

The rate constants for the disproportionations of uranium(V) in perchlorate solutions having hydrogen-ion concentrations between 0.01 and 1.9 M have been evaluated by adding a solution of chromium(II) at a constant rate to one of uranium (VI), employing a vibrating dropping mercury electrode to follow the variation of the concentration of either uranium(VI) or uranium(V). The resulting values are in acceptable agreement with those obtained by other techniques.