310 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



and HN0 3 the values 57.28, 55.60 and 56.40 respectively. There is, 

 however, a considerable degree of uncertainty attached to these calcu- 

 lations owing to uncertainties in the values of the transference numbers. 

 The errors with which transference measurements are affected are rela- 

 tively large and it is possible that consistent errors are present, in which 

 case the probable error of the determination cannot be estimated from 

 the consistency of a given series of measurements. In many respects, it 

 would appear that transference measurements by the moving boundary 

 method should be more nearly comparable than those by other methods. 

 In Table CXXIX are given values of the ion conductance Aj^+ of the 



A + 



potassium ion and of for the same ion for different potassium 



salts at concentrations of 0.02 N and 0.1 N. The ionization and con- 

 ductance values are taken from Noyes and Falk and the transference 

 values from Dennison and Steele. 4 * The numbers in the next to the last 

 column are the ion conductances, which should have the same value if 

 the conductance of a given ion at a given concentration were independent 

 of the nature of the other ion with which it is combined. In the last 



column are given the values of 



which, if the transference num- 



ber is independent of concentration and the ionization is measured by 

 the ratio -r-, should correspond with the conductance of the potassium 



A 



ion at infinite dilution. 



** Dennison and Steele, Phil. Trans. A, 205, 462 (1906). 



