200 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



number for different electrolytes in water at a concentration of 1.2 

 normal at 25. 



TABLE LXXX. 



TRANSFERENCE NUMBERS OP ELECTROLYTES AND SOLVENT FOR 

 AQUEOUS SOLUTIONS. 



HC1 CsCl KC1 NaCl LiCl 



5Pf ............ 0.844 0.491 0.495 0.383 0.304 



I 



T C Q ............ 0.820 0.485 0.482 0.366 0.278 



0.24 0.33 0.60 0.76 1.5 



In solutions of these electrolytes, the net transfer of water takes 

 place from the anode to the cathode, as shown by the values given in the 



W 



table for N . In these cases, correspondingly, the true transference 



numbers of the cations are larger than the ordinary transference num- 

 bers. It is obvious from Equation 48 that, as the concentration of the 

 solution decreases, the ordinary transference number approaches the 

 true transference number. The relation between the water carried by 

 the cation and that by the chloride ion is evidently given by the fol- 

 lowing equations: 



N^ =0.28 + 1.085^, 



(49) N* =1.3 +1.02 N, 



= 0.67 + 1.03 N, 

 =1.3 +1.02 

 =2.0 +1.61 



N w l =*- 7 + 2 ' 29 N 1 ' ' ' 



Since the hydration of the chloride ion is not known, the absolute hydra- 

 tion of the various cations may not be determined. If, however, a value 

 is assumed for the hydration of the chloride ion, then the hydration of the 

 other ions may at once be calculated by means of these equations. The 

 values of the hydration of the different cations for different assumed 

 values for the hydration of the chloride ion are given in the following 

 table: 



