0.000900 



A Decrease in Km 



□ •) >» Kn 



X " " Ko 



V " " Ks 



0.000500- 



i4il 4ie 



244 



*'% Ca Cl2 in solution 



Fig. 2. Curve showing the increase of a hypothetical salt compound Na4XCa 

 (see Table III) ; and the corresponding decrease of the velocity constants Kn, Kq, 

 Ks, and Km (these constants are given in Table II). The figures on the. abscissa 

 give the molecular per cent of CaCl2 in the mixture. The mixture containing 62.0 

 per cent CaCl2 is taken as the standard of comparison: proceeding from this to the 

 mixtures containing less CaCl2 we find that Na4XCa increases and the velocity 

 constants decrease as shown by the ordinates. In order to facilitate comparison 

 the values of Kn have been multipHed by 0.989; of Ko by 0.991; of Ks by 0.384; 

 and of iiTi/ by 0.251. 



420 



