394 



Dr. R. A. Lehfeldt on Electromotive 



Mean electromotive force of a cell containing equivalent 

 normal ZnCl 2 solution and 1 per cent, zinc amalgam (from the 

 four series) =1*0554 volts. 



Concentration-cells (with migration). 



Solutions. 



logC=-^. 



E.M.F. 



Volts X 10- 4 . 



y '■ y/io 



y/10 : ?//100 



2091 : 3091 

 3091 : 4091 



1309 

 427 



Zinc Sulphate. 



1st Series. — Twice normal solution and its dilutions. 

 Rod cells. 



gm.-equiv./litre. 

 1U00 C. 



log C=~ip. 



E.MF. 

 observed. 



"V'olts. 



E.M.F. 



differences. 

 Volts x 10-4. 



E.M.F. 



normal. 



Volts X 10-4. 



2 

 2/5 



2/25 



3-301 

 4(502 

 5 903 



1-4558 



> 183 



> 191 



+ 78 

 -105 

 -296 



2nd Series. — Twice normal solution and its dilutions. 

 Rod cells. 



gm.-equiv. /litre. 

 1U00 C. 



log C=-i[». 



E.MF. 



differences. 

 Volts x 10-4. 



E.M.F. 

 from normal. 

 Volts X 10-4. 



2 



3-301 





+ 85 



1 



3-000 



> 85 







1/2 



*699 



> 80 



- 80 



1/4 



4-398 



> 79 



-159 



1/8 



1 



4097 



> 77 



-236 



