ACCURATE MEASUREMENT OF IONIC VELOCITIES, ETC. 

 and from these two equations we obtain 



461 



= (L a +L,)x 



96540' 



and 



u + v = 



96540- 



We thus obtain the value of (U + V), and by multiplying this by the anion transport 

 number U/(U+V) we obtain U and, consequently, V also. 



It will be noticed that the figures given in columns 7 and 10 agree on the whole 

 much better with the directly observed mobilities than do those given in columns 8 

 and 11. In calculating the former our transport number has been used, those ot 

 KOHLRAUSCH having been used in calculating the latter. The two sets of transport 

 numbers are given in columns 4 and 5. 



The comparison can be made in the opposite manner, p. being calculated from the 

 actual mobilities from the relation 



p. = 



= a(u + v) x 96540 = (U + V) x 9G540. 



This calculation has also been made and the results are given in the second column of 

 the table, KOHLRAUSCH'S values for ^ being given in the third column. 



Table IV. contains a similar set of results to those given in Table III., the 

 measurements having been made at 25 with 10"' normal solutions. As conductivity 



TABLE IV. 



determinations at this temperature were not available, the calculated mobilities given 

 in columns 6 and 8 were obtained from our own conductivity measurements, which 

 are given in column 3 for comparison with the molecular conductivities (column 2) as 



