28 



The Philippine Journal of Science 



1918 



Substances. 



Salicylic acid 



Sodium salicylate. 



Methyl salicylate 

 portion. 



Tube 

 No. 1. 



0.497 

 none 



Tube 

 No. 2. 



0.51 

 none 



Aqueous portion. 



Tube 

 No. 1. 



trace 



Tube 

 No. 2. 



trace 

 0.69 



The following experiments were more carefully performed. 

 Tubes 1 and 2, of the shape shown in fig. 5, were constructed 

 with platinized platinum electrodes. 



xE 



Fig. 5.— Conductivity cell. 



The cell constants at 30° were: No. 1, 0.1913; and No. 2, 

 0.2158 Kohlrausch units. 



Equal quantities of water and methyl salicylate were sealed 

 in the tubes. The water employed had a specific conductivity 

 of 1.9 10 -6 . The U-shape of the cell permitted pouring the 

 water from the elongated leg into the leg containing the elec- 

 trodes, where its conductivity could be measured. 



The two cells were put into a steam bath, which remained 

 constant between 99° and 100°, and continuously rotated for 

 three hundred seventy-two hours for cell 1 and seven hundred 

 ninety hours for cell 2. At intervals, cell 1 was cooled to 30° 

 and the resistance measured. This cell broke after three hun- 

 dred eighty-four hours. 



The resistances measured at intervals were as follows; tem- 

 perature during measurements, 30°. 



Table XIII. — Resistance of cells during hydrolysis in water at 100". 



Time. 



E. 



Cell No. 1, 

 5 cc. water 

 5 cc. ester. 



Cell No. 2, 

 10 cc. water 

 10 cc. ester. 



H. m. 







3 15 



22 45 



46 45 



93 45 



128 15 



205 15 



272 15 



372 15 



2,800 



640 



184 



122 



77 



70 



52 



45 



40 



tube broken 























?90 



38 





