Table 503 

 ELECTROCHEMICAL EQUIVALENTS 



43 1 



Every gram-ion involved in an electrolytic change requires the same number of coulombs 

 or ampere-hours of electricity per unit change of valency. This constant is 96.494 coulombs 

 or 26.804 ampere-hours per gram-hour (a faraday) corresponding to an electrochemical 

 equivalent for silver of 0.00111803 gram sec. -1 amp.- 1 . It is to be noted that the change of 

 valence of the element from its state before to that after the electrolytic action should be 

 considered. The valence of a free, uncombined element is to be considered as o. The same 

 current will clectrolyze "chemically equivalent" quantities per unit time. The valence is 

 then included in the "chemically equivalent" quantity. 



The electrochemical equivalent for silver is 0.00111803 g sec.- 1 amp.- 1 . 



For other elements the electrochemical equivalent = (atomic weight divided by change of valency) times 

 1/96494 g/sec./amp. or g/coulomb. 



Note. — The change of valency for O2 is usually 2, etc. 

 Smithsonian Tables 



