ALUMINIUM HYDROXIDE BY ELECTROLYTES. 



TABLE 9. 



Concentration of the colloidal solution =0.00.3 »o alumina. 



13 



In order to facilitate the comparison, all the vaines of q 

 are collected in the following table together with the results 

 obtained with 0.05 ?'o colloidal solution. (See § 3). 



TABLE 10. 



Within the experimented range, the concentration of the 

 electrolyte, ^vhich causes complete coagulation, appears to be the 

 same for the colloidal solutions of different concentrations. In 

 order to observe the effect above mentioned the concentration had 

 to be varied within far wider range. Hence any generalisation 

 from the observations made on the aluminous solution containing 

 0.05^ AI2O3 will apply to all the solutions whose concentrations 

 are not very large. 



The value of '-j — 1 for the completely coagulated solution is 

 not quite proportional to the concentration, as might have been 



