Gregory Paul Baxter

A REVISION OF THE ATOMIC WEIGHT OF CADMIUM. PRELIMINARY PAPER.—THE ANALYSIS OF CADMIUM CHLORIDE.

variation in the conductivities of these compounds with dilution are given in a plate along with the acid amides. Sitromethane forms two addition products with the formulae respectively, CH,XO,. 2NH, and CH,NO,.SH,. Both compounds lose their ammonia when warmed up to laboratory temperature a t the atmospheric pressure. Tetranitromethane forms one addition product with ammonia having the formula C(NO,),.SH,. Excess of ammonia above one molecule brings about the decomposition of the tetranitromethane and the formation of the ammonium salt of trinitromethane. This compound is very easily soluble in ammonia and forms a solution possessing an excellent conductivity. The cyanides of the heavy metals and cyanacetamide, when dissolved in ammonia, show the remarkable phenomenon of a decrease of the molecular conductivity with the dilution in the more concentrated solutions. As the dilution increases the conductivity passes through a minimum and then increases with the dilution in the manner characteristic of salts in general. The uni-univalent salts show a wide variation in conductivity and degree of ionization with the dilution. Tables and curves are given showing these relations and comparing the behavior of salts in solution in ammonia with their behavior in aqueous solutions. In conclusion the authors take pleasure in acknowledging their indebtedness to Mr. Alex. Monroe for a liberal grant for carrying on this investigation and to Professor Lucien I. Blake, of the Department of Physics in the University of Kansas, for generously placing a t their disposal the facilities of his department. LELAXD STASFORD JR., CNIVERLITY AND THE L7WIVERSITY O F KASS45