Electrolysis of Alkali Salt -Vapours. 211 



E.M.F.'s than those which it was possible to use in these 

 experiments a further increase in the current might occur ; 



Fi<y. 2. 



Na 2 (t0 3 



eoo 



\?oo 



1300 



1400 



but in the absence of any evidence to the contrary, this 

 approximately constant value of the current will be regarded 

 in what follows as the maximum current which the amount 

 of salt used can carry. This current may be conveniently 

 termed the " saturation " current for the particular salt used. 



In the following table (p. 212) the values of this maximum 

 current observed with a number of different salt-solutions are 

 given under the heading current (C). The electrochemical 

 equivalent (E) and the value of the product EC are also given 

 for each solution. 



The temperature in each case was about 1350° C, and the 

 E.M.F. used 810 volts. 



It is clear from these results that the saturation current 

 is inversely proportional to the electrochemical equivalent of 

 the salt. The mean value 2*67 x 10~ 2 of the product EC for 

 solutions of 1 gram in a litre is also very approximately 

 one-tenth of the value 2*65 x 10 -1 obtained with solutions con- 

 taining 10 grams in a litre, which shows that the saturation 



P2 



