106 



SOAPS AND PROTEINS 



calcium soap the former settles out with greater difficulty than 

 the latter, as may be seen by comparing Figs. 72 and 73. In 

 the higher concentrations of the calcium salt, the calcium oleate 

 comes down in very finely divided (colloid) form and so remains 



FIGURE 72. 



suspended in the liquid as shown in the tubes marked 5 and 10 

 of Fig. 73. 



The formation of the metallic soaps with their extremely low 

 hydration capacities again dominates the picture when cupric 

 or ferric chlorid is added to potassium oleate. As shown in 



FIGURE 73, 



Tables LI 1 1 and LIV the soaps as formed tend from the first to 

 collect in hard, dry lumps within the freed dispersion medium. 

 Matters are further complicated in these experiments by a partial 

 separation of fatty acid due to the fact that the added salts yield 

 an overplus of acid on solution and hydrolysis in water. 



