SALTS OF ALBUMIN AND ACIDS 



7 1 



is, however, only true if acids of the same normal concentration 

 are compared ; if solutions of the same hydrion concentration 

 are compared, then the quantity of the weaker acetic acid which 



Aa'dcoiAcSa 



HCl 



0-oz 



0-01 



Q'Oi O'OZ 0'0& 



FIG. 15. Combination with various acids. 



combines is notably greater. Thus a 0-2 N acetic acid corre- 

 sponds to a 0-002 N hydrochloric acid ; but nearly 9 x io~ 3 N 

 acid is combined in the former case or more than four times as 

 much as in the hydrochloric acid solution. The same result is 

 met with in the swelling of gelatin in various acids. 



Table 27 (Fig. 15). 

 Horse-serum Albumin (i'26 per cent.) + Acetic Acid. 



In the work of Manabe and Matula already quoted, in which 

 the relation between combination with acid and concentration 

 of albumin was studied, a relative increase in the extent of 

 combination as the content of albumin decreased was observed. 



