48 JouEisrAL OF THE MiTCHELL SociETY \_Octoher 



Nernst formula holds for dilute solutions of silver nitrate. From 

 tlie value of K found above the values of u and v may be calcu- 

 lated by substitution of the proper values of the other quantities 

 in the equation 



RT 2v 



K = ; — lege 10 



nF u+v 



Taking K=0.0623 the value of v is 0.523 while the observed 

 value, given by Lehfeldt^ is 0.528. 



The table compiled by Lehfeldt indicates that the value of v 

 is less for concentrated solutions and this would make the value 

 of K smaller in proportion. The present results are in harmony 

 with this fact, although it is impossible as yet to calculate the 

 electromotive force between two solutions of silver nitrate of 

 such concentrations that the migration ratio of the two are dif- 

 ferent. 



The following table gives the results of measurements of the 

 electromotive forces of three combinations where ethyl alcohol 

 was used as solvent. 



The experimental values are consistent among themselves as the 

 sum of (1) and (3) is 106.7 against 106.6 for (2). 



The relative ionic concentration of silver ions was determined 

 by conductivity measurements the results being given in the 

 next table. 



TABLE IV 



Concentration. Resistance. 



o.i 208.5 



O.OI 1024.0 



o.ooi 6420.0 



Again assuming that at all the concentrations employed the 

 values of the migration ratios remain constant, the value of K 



^Electrochemistry, p. 256 (1904). 



