Magnetic Susceptibility of Nickel and Cobalt Chloride Solutions

Abstract

The Magnetic Susceptibilities and Magneton Numbers of Nickel and Cobalt in Aqueous Solutions of their Chloride Salts.---The susceptibilities of solutions have been found by a modified form of the "Kelvin-Wills" method. Data is given for nickel chloride solutions ranging in molar concentration from 0.001000 to 3.765 and for cobalt chloride solutions from 0.001018 to 2.0353, for field ranges of 3,000 to 14,000 gausess for the lower concentrations and 3,000 to 10,000 for the higher. All measurements were made at a temperature of 20\ifmmode^\circ\else\textdegree\fi{} C.The susceptibilities of the salts have been computed from the susceptibilities of the solutions by application of the Wiedemann law, and the susceptibilities of the metals obtained by extending the Wiedemann relation to the salts.The susceptibilities of the solutions measured were found to be independent of the field strength throughout the ranges of field used, and the susceptibilities of the salts, both nickel and cobalt, were found to be independent of the concentrations of the solutions. The value found for the molecular susceptibility of nickel is 0.004423 and of cobalt 0.010362. These values give upon application of Weiss's equation 16.0 and 24.5 magnetons respectively for the nickel and cobalt atoms.Susceptibility of Air.---An auxiliary result obtained in the experiments is that the volume susceptibility of air at 20\ifmmode^\circ\else\textdegree\fi{} C. and average conditions as regards pressure and moisture extending over a number of months is 0.0288 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}6}$.