A method for the determination of the conductivities of solution without the use of contacting or dipping electrodes is described. This involves the use of a transformer ratio-arm bridge operating a t audio-frequencies, and this is described in detail. Results obtained for concentrated solutions of barium chloride, magnesium sulfate and potassium ferro-and ferricyanides are given.
I n recent years, a great deal of attention has been given to the study of non-aqueous solutions, especially from the point of view of the theory of ionization. While this work has covered a wide range of solvents, the
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