The limited results previously reported on the behavior of the tungsten electrode in solutions of different pH values are conflicting. This is clarified here by calculating the potentials of the different oxides of tungsten and comparing them with the experimental results. It is found that the behavior of the tungsten electrode depends upon whether i t is massive or in the powdered form. From this study it has been found possible to define clearly the pH range over which the tungsten electrode can function properly as an indicator electrode for hydrogen ion activity. The anodic oxidation of tungsten a t very low current density is studied and the nature of the different oxides of tungsten which are apt to be formed on the electrode surface has been revealed. From all these studies it is shown that the tungsten electrode is far better than the antimony electrode as an indicator electrode for the hydrogen ion activity since u. calibration curve can stand for much longer period without any of the appreciable drift characteristic of the antimony electrode.

By the application of a modified form of Onsager's equation to dilute solutions of glycerol in isopropyl alcohol and isobutyl alcohol, and conversely to dilute solutions of each of the latter two alcohols in glycerol, it is found that the apparent solution moments of these alcohols, at the condition of infinite dilution, are 2.68, 1.61, and 1.66 D respectively over the temperature range 30 to 50 OC.

NotesVol. 61 awkward to describe in valence bond terms, and not easy to fit into the bond-overlap criteria of crystals of the compound, but also for calling our attention to this problem. The aid of Dr. James W. Richardson in the MO treatment is also gratefully acknowledged.

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