24 



The Philippine Journal of Science 



1918 



Table IX. — Conductivity data for methyl salicylate, the dissociation in 

 aqueous solution, and the rate of hydrolysis. First series. 



Cell No. 2. Constant = 0.1670. Temperature 30°. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



t. 



60* 



R = 



ohms. 



f-10— 3 

 for 



ester. 



A for 



ester. 



a for 

 ester. 



K A 



for ester. 



K= 



C-104 

 R 



f-10— 3 



for sali- 

 cylic 

 acid. 



X. 



Afor 

 sali- 

 cylic 

 acid. 



h et 





 3 



5.5 

 22 



25.5 



45 



363 



407 



454 



649 



507 



842 



1,053 



1,269 



27,900 



21,900 



20,000 



15, 200 



14,400 



12,900 



6,100 



6,895 



5,495 



6,200 



4,980 



3,780 



3,520 



3,180 



Average 



200 

 200 

 200 

 200 



0.217 

 0.55 

 0.69 

 1.22 



0. 00057 

 0. 0014 

 0. 0018 

 0. 0032 



1. 7- 10-u 



1. • 10-u 

 1.6-10-n 



5. 1 - 10-u 











































0.116 

 0.129 

 0.274 

 0.283 

 0.304 

 0.321 

 0.335 

 0.442 

 0.475 

 0.525 



















29, 900 

 14,500 

 13, 900 

 13,200 

 12,500 

 11,900 

 8,900 

 8,100 

 7,300 



0. 04334 

 0. 04689 

 0. 04720 

 0. 04758 

 0. 04800 

 0. 04841 

 0. 031124 

 0. 031245 

 0.0.01370 



a (387) 

 397.1 

 393.8 

 401.1 

 401.6 

 399.0 

 393.2 

 384.4 

 382.5 













6.3-10—7 

 5. 9 • 10—7 

 5. 6 • 10—7 

 4. 9 • 10—7 

 4. 7 • 10—7 

 4. 4 • 10—7 

 3.9-10—7 

 3.6-10—7 

































































4. 9 • 10—7 















a Value at infinite dilution = AOO. 



The hydrolysis was continued for twenty-three days longer, 

 but the changes in the resistance of the solution were so un- 

 certain, undoubtedly due to the action upon the glass, that the 

 experiment was discontinued. 



Analysis of the contents of tube. 



Compound. 



Methyl salicylate 

 Salicylic acid 



Calculated to 100 cc. 



0.0739 

 0.0048 



The percentage of methyl salicylate is slightly less than the 

 solubility, and the amount of salicylic acid formed from the 

 methyl salicylate at the end of twenty-three days is about two 

 and one-half times the quantity shown by the conductivity at 

 the expiration of twelve hundred sixty-nine hours. 



The results of a duplicate experiment performed in a third 

 cell are recorded in Table X. 



