120 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



TABLE 67. Temperature coefficients of conductivity of silver nitrate. 



Some of the values in table 66 are plotted as curves in figs. 42 and 43, the 

 abscissae representing the different percentages of acetone, and the ordinates 

 the molecular conductivities. It will be seen that at 0, for all dilutions but 

 the lowest investigated, N / 50, there is a pronounced point of inflection that 

 appears in the 75 per cent acetone mixture. At 25 it has almost dis- 

 appeared, but still manifests itself at the higher dilutions. The curves are 

 almost identical in form with those obtained by Jones and Bingham 1 for 

 calcium nitrate, in mixtures of the same solvents. 



Table 67 shows that the temperature coefficients increase with the pro- 

 portion of acetone up to the 50 psr cent mixture, but a further increase in 

 the proportion of acetone produces a rapid fall in the values for the tempera- 

 ture coefficients. With increase in concentration, the maximum value tends 

 to shift to the 25 per cent acetone mixture. These results are also nearly 

 identical with those obtained by Jones and Bingham with calcium nitrate. 



The similarity of the curves (figs. 48 and 49), plotted from the values given 

 in table 66, to the corresponding curves obtained by Jones and Bingham 

 for calcium nitrate, is even more striking than in the case of the methyl 

 alcohol and acetone mixtures. A pronounced maximum manifests itself 

 at both and 25, appearing in the 25 per cent acetone mixture in the more 

 concentrated solutions, and shifting, with increase in dilution, through the 

 50 per cent to the 75 per cent mixture. 



1 Amer. Chem. Journ., 34, 481 (1905). 



