?0i 



also be in internal equilibrium, so that when in the metal the molecules 

 M and M^ are in equilibrium, there will be equilibrium between the 

 ions M" and M^-' in the electrolyte. So the sini|)le.st assumption 

 is this that the difFerent ions are emitted hy the metal, though this 

 need not take place in the ratio in which they are present as molecules 

 in the metal. In this way we then arrive at the result that the unary 

 electromotive equilibrium may be considered as a special equilibrium 

 in the series of electromotive equilibria of homogeneous mixed crystals, 

 which we may imagine as being built up of the molecules M 

 and M^ in different ratio. 



Let us now suppose that tig. i ^) for a definite T,P and a definite 

 total metal-ion concentration indicates the potential difference L 

 between electrolyte and metal as function of the concentration. 



The point a denotes the potei^tial of a solution of an J/-salt of 

 definite metal-ion concentration containing exclusively iV/ "-ions, with 



1, Gf. Reindeks. Zeitschr. f. Phys. Ghem. 42, 225 (1902). 

 Proceedings Royal Acad. Amsterdam. Vol. XVI, 



45 



