CHAPTER VI. 



THE CONDUCTIVITY AND VISCOSITY OF CERTAIN RUBIDIUM AND 



AMMONIUM SALTS IN TERNARY MIXTURES OF GLYCEROL, 



ACETONE, AND WATER AT 15, 25, AND 35. 



BY P. B. DAVIS AND W. S. PUTNAM. 

 INTRODUCTION. 



The fairly extensive investigations of Jones and his collaborators on 

 conductivity and viscosity in the field of mixed solvents, have been 

 brought together and correlated in two elaborate monographs pub- 

 lished by the Carnegie Institution of Washington. 1 



By far the greater part of this previous work has been devoted to 

 binary mixtures of the various solvents studied, as well as to the pure 

 solvents themselves. Up to the present, the work has covered very thor- 

 oughly the determination of the conductivity and viscosity coefficients 

 of a large number of compounds, both inorganic and organic, in water, 

 and in acetone, glycerol, and the alcohols, as well as in binary mixtures 

 of the latter solvents with one another and with water. Thus far, how- 

 ever, few if any attempts have been made to carry out a systematic 

 study of the behavior of such compounds in ternary mixtures contain- 

 ing the above-named solvents. Such, then, has been the object of the 

 present investigation, which may be taken as the initial step in a series 

 of similar researches. 



Before taking up the discussion of this phase of the subject, a short 

 review of the various relations and deductions brought out by previous 

 investigators in the field of mixed solvents, should serve as a fitting 

 introduction to the present work, by calling to mind the various lines 

 of evidence bearing on this subject. 



However, since we have been concerned more particularly with 

 glycerol, acetone, and water in this and in previous contributions to the 

 literature on the subject, the review following will be confined to the 

 investigations covering these three important solvents. Moreover, the 

 work in mixed solvents containing the alcohols has recently been care- 

 fully reviewed in a previous article. 



The first important work in mixed solvents contai ning acetone was 

 that of Jones and Veazey. Prior to their investigations, Bingham and 

 others had made some preliminary determinations of conductivities 

 and fluidities in this solvent along with their work in the alcohols. 

 Thus, Bingham noted the characteristic minima occurring in the con- 

 ductivity curves for certain salts in acetone-water mixtures, and pointed 

 out that a connection undoubtedly existed between this and a similar 

 phenomenon in the fluidity curves for such mixtures. 



Carnegie Inst. Wash. Pubs. Nos. 80 and 180. 



117 



