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A viscometer, the inside of which was thoroughly coated by silicon grease, was prepared because it is difficult to measure precisely the viscosities of aqueous solutions of tetraphenylonium salts by means of a usual flow-type viscometer because of the characteristic peculiar to these solutions, that they make the glass wall water-repellent and water droplets tend to adhere to it. By comparing the relative viscosities on sucrose and LaCl3 in water obtained by the coated viscometer with those found in the literature, it was confirmed that the viscometer operates adequately. The viscosities of Ph4PCl, Ph4PBr, Ph4PNO3, Ph4AsCl, and Ph4AsBr in water have been measured at 15, 25, and 35 °C. The ionic B-coefficients determined at 25 °C are 1.09 mol−1 for both cations, while the ionic activation energies for viscous flow are +4.98 and +5.02 kJ/mol for Ph4P+ and Ph4As+ respectively.

The distribution equilibria of thenoyltrifluoroacetone (TTA) and its scandium chelate between aqueous solutions with an ionic strength of 0.1 and ketones at 25°C have been studied. The distribution of TTA was correlated with the solubility parameters of the ketones and the correlation between the distribution coefficients of TTA and those of scandium chelate was confirmed. The characteristic properties of ketones were discussed in comparison with those of other oxygen containing solvents.

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