258 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



TABLE GIL Continued 



E. Solubility of o-Nitrobenzoic Acid in the Presence of 

 Hydrochloric Acid. 



Hydrchloric Solubility, Solubility, 



acid, gravimetric, volumetric, 



normal. mols per liter. mols per liter. 



0.04320 0.04360 



0.0179 0.03681 



0.0357 .... 0.03390 



0.125 0.02980 



0.25 0.02922 



0.5 0.02846 



presence of hydrochloric acid, it will be observed that the solubility de- 

 creases greatly on the initial addition of hydrochloric acid, after which 

 the solubility decreases slightly, practically as a linear function of the 

 concentration. In the presence of the weaker acids, the initial decrease 



O.04 



O.OJ 



0.01 



O-NlTROBENZOC AoO IN HCt 



SALICYLIC ACID IN HG. 



0.0 



6.S 



O.I 0.2 O.3 



Concentration of Added Acid. 



FIG. 49. Solubility of Moderately Strong Organic Acids in Water in the Presence 

 of Hydrochloric Acid at 25. 



is relatively slight, and this decrease is the smaller the weaker the added 

 acid. The solubility of salicylic acid in the presence of acetic acid 

 increases from the beginning. In the case of the organic acids the solu- 

 bility eventually increases, practically as a linear function of the con- 

 centration of the added acid. The results are in harmony with the 





