HETEROGENEOUS EQUILIBRIA 



269 



are much more complex than in that of binary salts and the results are 

 accordingly more difficult to interpret. A considerable amount of experi- 

 mental material exists, much of which is due to Harkins. 32 



In Table CVI are given values of the solubility of silver sulphate in 

 water at 25 in the presence of different electrolytes. The concentrations 

 are expressed in millimols, C X 10~ 3 , per liter. The results for this, as 

 well as for other ternary salts, are shown graphically in Figure 53. The 



8, 



1 

 ~ 





0.08 



PbCl, 



0.076 



Tl,C,O t 

 0.072 



0.068 

 0.064 

 0.060 



0.056 



A gl S0 4 



0.052 



0.048 

 0.044 



Ba<BrO,) f 

 0.040 



0.036 

 0.032 

 0.028 



0.024 



0.020 



o.o 1 6 



0.012 



0.008 



0.004 



B*(IO,), 



o.o 



\ 



0.0 0.025 0.05 0.10 0.20 



Concentration of added salt in equivalents. 



FIG. 53. Solubility of Ternary Electrolytes in Water in the Presence of Other 



Electrolytes. 



results for lead iodate are given in Table CVII and are shown graphically 

 in Figure 54. 



An examination of the figures and the data given in the tables shows 

 that, in general, electrolytes of the same type have a similar influence 

 upon the solubility of a ternary electrolyte. This is particularly true 



"Harkins, /. Am. Ohem. 8oc. 33, 1807 (1911) ; <M<i., 58, 2679 (1916). 



