The conductances and viscosities of aqueous solutions of indium tribromide, indium nitrate, and aluminum bromide at 25 °C

Abstract

The specific and equivalent conductances of aqueous solutions of indium tribromide, aluminum tribromide, and indium nitrate at 25 °C have been determined at concentrations ranging from 4.771 to 0.00577 N. The results for indium tribromide are in good agreement with those of Heydweiller (for 18 °C), the only previous figures, and which are limited to the relatively concentrated range. Below a concentration of 0.005 N, results for indium tribromide are valueless, because the conductance increases with time, owing to progressive hydrolysis. It is therefore not possible to determine the limiting conductance of indium tribromide experimentally. Although the aluminum trichloride results are independent of time, there is probably also a certain amount of hydrolysis at extreme dilution.The transport number of In3+ in InBr3 was determined at different concentrations, using the Hittorf method. The limiting value of the transport number, obtained by extrapolation to zero concentration, was 0.454. This leads to values of 62.1 mhos for [Formula: see text] and 140.5 mhos for Λ0 for [Formula: see text] These values are very different from those previously obtained (1), which were founded on an assumption which now appears to be untenable.The viscosities of aqueous solutions have also been determined and the results for the dilute region fitted to the Jones and Dole rule.