260 



THEORY OF COLLOIDAL BEHAVIOR 



Table XLIX shows the relative flocculating efficiency of 

 cations on alcoholic solutions of Na gelatinate. Ten cubic 

 centimeters of 1 per cent Na gelatinate of pH 10.0 were mixed 

 with 50 c.c. of absolute alcohol. The mixture is slightly opales- 

 cent. Ten cubic centimeters of the mixture were titrated with 

 various salt solutions until precipitation occurred. 



TABLE XLIX. FLOCCULATING CONCENTRATION OF DIFFERENT SALTS AND 

 ALKALIES IN AN ALCOHOL-WATER MIXTURE OF Na GELATINATE 



There are again two distinct groups, this time according to the 

 valency of the cation. All electrolytes with monovalent cation 



40 1 



require a molecular concentration of almost ., . = and all 



l, 



