viii, a, i Gibbs, Williams, Galajikian: Methyl Salicylate IV 23 



was more resistant to the solvent action of acids, and the 

 amount of methyl salicylate was so reduced that the quantity 

 of salicylic acid which it would remove from the water would 

 be negligible. The temperature was maintained at approx- 

 imately 30° throughout the experiment. 



The cell was charged with 15 cubic centimeters of water and 

 2 drops of pure methyl salicylate and then carefully sealed. 

 A very small quantity of the ester remained undissolved. 



The first reading, t was made after shaking the cell vigor- 

 ously for one-half minute. In Table IX, the data given are: 



Column 1. t=time in minutes. 



2. The resistance of the cell in ohms. 



3. The concentration of the ester taking the molar solubility as 



0.005. 



4. The molecular conductivity of the ester corrected for the con- 



ductivity of the water. 



5. The degree of dissociation of the ester, A oo =: 386. 



6. The affinity constant (K A ) of the ester calculated from the 



preceding data. 



7. K, the specific conductivity, as calculated from the resistance 



capacity of the cell and the data in column 2. 



8. The concentration of the salicylic acid estimated, from K in 



column 7, upon a curve plotted from values calculated from 

 the data in Kohlrausch and Holborn. 



9. The molar concentration of the salicylic acid calculated from 



data in column 8. This value is also X, the amount of 

 methyl salicylate hydrolyzed in time t. 

 10. The molecular conductivity of the salicylic acid solution cal- 

 culated from the data in columns 2 and 8 and the resistance 

 capacity of the cell and not corrected for the conductivity 

 of the water and the methyl salicylate in solution. These 

 values give some idea of the accuracy of the work. 



<OH 

 COOCH +HjO 



= C 6 H4<^qq OH + CH 3 OH calculated from dx/dt=K H e in which 



the constant e =0.005, the solubility of methyl salicylate in water 



at 30°. Therefore K = -• 

 H et 



While the values for e are constant, limited by the solubility 

 of the methyl salicylate, it seems more accurate to regard e as 

 a variable which, as it diminishes, is regularly increased by 

 another variable so that at each interval of time it assumes 

 the same value. 



