The behaviour and structure of uranyl nitrate in organic solvents—III: Investigations of anhydrous uranyl nitrate solutions in ketones by conductivity method

Abstract

In this work we present the results of conductance measurements on anhydrous uranyl nitrate solutions in acetone, methylethylketone, methylisobutylketone and n-heptanone-2. Anhydrous uranyl nitrate in ketonic solutions behaves as a very weak 1:1 electrolyte: UO 2(NO 3) 2 ⇌ UO 2NO 3 + + NO 3 −. The results obtained from experiment were analysed by the Fuoss-Kraus method. The ratios K A Λ 0 2 were obtained ( K A = association constant). From the Walden's rule Λ 0 η 0 = const., the limiting molar conductivities Λ 0mole have been found and from the ratios K A Λ 0 2 the association constants, ΔG and Bjerrum's parameters were calculated. Similar calculations have been made for the data previously obtained (1) from conductivity studies on uranyl nitrate hexahydrate solutions in acetone, methylethylketone and methylisobutylketone. Comparing the results obtained for anhydrous uranyl nitrate and hexahydrate uranyl nitrate solutions in these ketones it is obvious that the anhydrous compound is a weaker electrolyte than the hexahydrate.