22 



The Philippine Journal of Science 



1913 



and 0.5 cubic centimeter of methyl salicylate. While the con- 

 ductivity of the aqueous solution of methyl salicylate can be 

 estimated in this experiment, it is obviously impossible to follow 

 the hydrolysis with any degree of accuracy, for the reason 

 that a considerable proportion of salicylic acid is removed from 

 the aqueous solution by the methyl salicylate. 



The first measurement, t , was made after vigorously shaking 

 together the methyl salicylate and the water for one-half minute. 

 The tube was then placed on a revolving wheel and agitated 

 continuously between successive observations. 



In the following table, t is the time in minutes; R, the re- 

 sistance in ohms; £ the dilution, that is, the number of liters 

 containing a gram molecule; A, the molecular conductivity; a, 

 the degree of dissociation; and K A the affinity constant of the 

 methyl ester of salicylic acid. 



Table VIII. — Conductivity of methyl salicylate in aqueous solution. 



Cell No. 1. Constant = 0.1549. Temperature = 30°. 



t 



60. 



R = ohms. 



f ■ 10-3. 



A. 



a_ 



K A . 





 116 

 193 

 235 

 284 

 331 

 649 



17,040 

 16, 360 

 13,400 

 12,200 

 11,900 

 10, 900 

 8,100 



200 

 200 



0.80 

 0.91 



0. 00212 

 0. 00247 



2. 2 • 10-H 

 2. 9 • 10-n 











































At this time, the cell was placed on an open steam bath to 

 hasten the action, and at ^=1768 the resistence had dropped 



to 355 ohms, a point approaching equilibrium. 



The tube was opened, and the contents analyzed as follows : 



Water solution, 15 cubic centimeters. 



Q , . . „„ Amount in 



Substance. m cc 



Methyl salicylate 0.0927 



Salicylic acid (almost all present as salt) 0.0792 

 Methyl alcohol 0.0181 



Methyl salicylate solution, 0.5 cubic centimeter in volume. 



Salicylic acid "0.272 



■ This determination is perhaps not very accurate. 



In order to avoid some of the difficulties experienced in the 

 first experiment, a second cell was constructed of glass which 



