94 



CONDUCTIVITY AND VISCOSITY OF SOLUTIONS 



than the sodium on the solvent, this being the same in both cases. 

 Although the ionic velocity of the potassium is the greater, this greater 

 volume tends to slow it down more as the alcohol is approached. 



There is an unusual downward deflection in the curves beyond 

 the 80 per cent alcohol, increasing in steepness as the 100 per cent 

 alcohol is approached, which at first puzzled us every much. The 

 asymmetry, that is, the unsj^mmetrical appearance of our conductivity 

 curves, had already been noted. Then the question arose, what would 

 be the appearance of a symmetrical curve if the viscosity and con- 

 ductivity at either end were symmetrical with respect to the 50 per cent 

 mixture? What kind of a curve would we have? The answer to this 

 question is given in figure 42, from which it can be seen, on comparison 



150 

 140 

 130 

 120 



no 



100 

 90 



:! so 



f 70 



a 



60 

 50 

 40 

 30 

 20 

 10 

 



10 20 30 40 50 60 70 80 90 100 



Percentage alcohol 

 FIG. 43. N/128 Nal. 



140 

 130 

 120 



no 



100 



90 



f 80 



CJ 



- 70 

 ^60 

 50 

 40 

 30 

 20 

 10 

 



10 20 30 40 50 60 70 80 90 100 



Percentage alcohol 

 Fio. 44. N/1024 Nal. 



with the curves for the actual conductivity, that in the latter the point 

 of symmetry has been shifted from the 50 per cent mixture to the 80 

 per cent, and that the end on the alcohol side is not really at the 100 

 per cent alcohol, but is imaginary, since the line at the 100 per cent 

 point must be extended to make the curve symmetrical. To be more 

 exact, we see here shifting similar to that noted above in the case of the 

 transition-point in the fluidity ; only, this happens at every temperature 

 instead of with rise in temperature. 



As the temperature rises the conductivity curves tend to become 

 more and more nearly a linear function, that is, those for 35 have 

 much less bend to them than those for 15. A probable explanation 



