356 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



tance varies continuously between that of the two components. It is 

 true that a few irregularities occur, but these are small and probably lie 

 within the limits of experimental error. The fused salts are characterized 

 by the great similarity in their behavior. As has already been pointed 

 out, the order of magnitude of the conductance is the same for all typical 

 fused salts. 



In the following table are given values of the conductance of thallium 

 and silver salts at 600 . 8 



TABLE CXXXIX. 

 CONDUCTANCE OF THALLOTJS AND SILVER SALTS AT 600. 



Til 0.840 Agl 2.43 



TIBr 1.127 AgBr 3.08 



T1C1 1.700 AgCl 4.16 



In both cases, the conductance of the salt increases in the order: iodide, 

 bromide, chloride. The conductance of the silver salts is markedly 

 greater than that of the thallium salts. 



A great many data are available relating to the conductance of fused 

 salts, 9 but, in view of the similarity in the behavior of the different fused 

 salts, it is unnecessary to give here in detail the various observations 

 which have been recorded. Thus far, the subject has been studied chiefly 

 from an empirical point of view and we possess but little knowledge of 

 the molecular condition of these substances. 



The form of the conductance curve of mixtures of sodium and potas- 

 sium nitrate and of silver chloride, iodide and bromide indicates 

 that in these mixtures complex ions are not formed. In some other in- 

 stances, however, there is a probability that complex ions may exist. 10 

 This is the case, for example, with mixtures of potassium chloride and 

 lead chloride. Lorenz has carried out transference measurements which 

 indicate that a complex of the type K 2 PbCl 4 is probably formed in the 

 mixture. 



3. Conductance of Glasses. For want of a suitable reference sub- 

 stance, transference measurements with the fused salts have not been 

 carried out, and as a consequence we lack any knowledge as to the pro- 

 portion of the current carried by the two ions in these electrolytes. In 

 a few instances, however, particular systems have been investigated in 

 which the current is carried entirely by either the positive or the nega- 



Tubandt and Lorenz, loc. cit. 



9 Lorenz. "Electrolyse geschmolzener Salze, Monographien u. Angew. Electrocb," 20 

 (1905). 



Lorenz, Ztschr. /. phya. Chew. 70, 230 (1910). 



