THE CONDUCTANCE OF SOLUTIONS VISCOSITIES 



131 



from which equation the effect of pressure upon the conducting power of 

 the ions may be determined. In a solution at a concentration of 0.01 N 

 the effect of pressure on the viscosity will not differ materially from 

 that on the pure solvent. It might be expected that the effect of pressure 

 on the conductance of the ions would vary inversely as the viscosity change 

 of the solution. Indeed, Tammann, on comparing the conductance-pres- 



Pressure. 



000 ZOOO ZMO 



tfff 



MOO 



3500 



FIG. 25. Comparison of the Influence of Pressure on the Conductance and the 

 Fluidity of Dilute Aqueous NaCl Solutions at Different Temperatures. 



sure effects as calculated according to Equation 44 for 0.1 N sodium 

 chloride with the measured viscosity effects of Cohen, found almost an 

 exact correspondence as may be seen from Figure 25. 22 The points on 

 this figure represented by combined cross and circle are measured vis- 

 cosity values of Cohen, while the curves represent the values of the vis- 

 cosity effect as determined from conductance measurements according to 

 Equation 44. Measurements by Korber, 23 while confirming the results 

 of Tammann for sodium chloride, show that the viscosity-conductance 

 effect due to pressure in the case of different electrolytes is a function 



"Tammann, Wted. Ann. 69, 773 (1899). 



Korber, Ztschr. f. phj/s. Chem. 67, 212 (1909). 



