The Coagulation of Arsenious Sulphide Sol l>y Cobaltic Complexes 7 



quantity of the adsorbent, and the equihbriuin concentration. As 



a nrst approximation, we may take S , or S in the place of C 



of the above equation [Freundlich, loc. cit.]. If we replace S 

 with C, "we obtain the next equation : 



^=«S^ (5) 



And comparing the case of the N-valent, and the monovalent, we 

 can easily deduce the following equation : 



^^ = asj and ^L. ^ ,, gf 



x^ 



X 



" = (lf)" "-^ (f)=-| ■••••(«) 



According to the opinion of Freundlich, 



a^N _ 1 



X, N 



Therefore the equation (6) may change to the following: 



(ir=^ (7) 



Thus it is clear that ß in the equation (o) is identical with one of 

 the constants of the adsorption isotherm, ß has been found to be 

 equal to 4 in the present experiments. It is quite possible in the 

 case of the cobaltammines that the irregularity observed in coagu- 

 lation experiments with the normal salts would be absent, as the 

 cobaltammines used had all their co-ordination valencies satisfied, so 

 that they had no furtlier tendency for complex formation in aqi^eous 

 solution, the adsorbability should, therefore, be the same for ions 

 with different valencies and hence the effect of valency is likely to 

 be the sole factor. As show^n by the table III the limiting values 

 calculated from the equation (4) are in fair agreement with those 

 found by the experiment. 



